[ruby-core:111342] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
20 Dec
2022
20 Dec
'22
10:12 a.m.
Issue #19246 has been reported by thomthom (Thomas Thomassen).
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246
* Author: thomthom (Thomas Thomassen)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
20 Dec
20 Dec
10:19 a.m.
New subject: [ruby-core:111343] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by thomthom (Thomas Thomassen).
Additional note: For development purposes there are also need to remove from
`$LOADED_FEATURES` in order to reload files without reloading the application. The
application being a desktop application makes it not ideal to restart it every time you
make a source code change while developing a plugin. In this case is performance impact is
also a major issue as you'd constantly be hit with extremely slow reloads.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-100717
* Author: thomthom (Thomas Thomassen)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
10:34 a.m.
New subject: [ruby-core:111345] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by thomthom (Thomas Thomassen).
One more thing (Sorry for sounding like Colombo), we also remove items from
`$LOADED_FEATURES` when plugins are updated. Because the application is long running and
we have a plugin manager that lets the user install new versions we remove all entries in
`$LOADED_FEATURES` that belong to the plugin being updated in order to allow the update to
take effect immediately. At the moment there is no other means than manipulating the
global directly. And in 3.1 the performance impact is too great to be put in front of
users. (Something like `rb_unprovide` would be nice.)
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-100719
* Author: thomthom (Thomas Thomassen)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
28 Feb
28 Feb
4:04 p.m.
New subject: [ruby-core:112632] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by MSP-Greg (Greg L).
This does seem like a considerable slowdown on Windows.
The above code uses absolute paths with `require`, and also adds nonexistent files to
`$LOADED_FEATURES`. I changed the code so that all requires are simply a
`File.basename`,
and the items pushed to `$LOADED_FEATURES` are real files. Below is data for several Ruby
versions, run with both Windows and WSL2/Ubuntu 22.04.
The 'normal' & normal again' benches each require 200 files. The
'loaded features' bench requires 200 files, and additionally adds 200 different
file names to `$LOADED_FEATURES`.
Adding items to `$LOADED_FEATURES` has worse performance with Ruby 3.1 and later on both
Windows & Ubuntu, but the Windows degradation is orders of magnitude larger.
[Issue 19378 'Windows: Use less syscalls for faster require of big
gems'](https://bugs.ruby-lang.org/issues/19378) seems to involve the same problem.
Windows
```
user system total real
ruby 2.7.7p221 (2022-11-24 revision 168ec2b1e5) [x64-mingw32]
normal 0.016000 0.047000 0.063000 ( 0.103496)
loaded features 0.031000 0.031000 0.062000 ( 0.157406)
normal again 0.000000 0.094000 0.094000 ( 0.100160)
ruby 3.0.5p211 (2022-11-24 revision ba5cf0f7c5) [x64-mingw32]
normal 0.000000 0.063000 0.063000 ( 0.100240)
loaded features 0.032000 0.031000 0.063000 ( 0.156637)
normal again 0.000000 0.062000 0.062000 ( 0.098520)
ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x64-mingw-ucrt]
normal 0.000000 0.062000 0.062000 ( 0.174335)
loaded features 3.141000 18.860000 22.001000 ( 33.106847)
normal again 0.015000 0.265000 0.280000 ( 0.400028)
ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x64-mingw-ucrt]
normal 0.000000 0.157000 0.157000 ( 0.168443)
loaded features 3.516000 18.547000 22.063000 ( 32.569175)
normal again 0.047000 0.218000 0.265000 ( 0.390879)
ruby 3.3.0dev (2023-02-27T15:23:31Z master ea830ab29d) [x64-mswin64_140]
normal 0.015000 0.094000 0.109000 ( 0.175751)
loaded features 3.235000 16.640000 19.875000 ( 31.294871)
normal again 0.031000 0.203000 0.234000 ( 0.386469)
user system total real
require 800 0.015000 0.235000 0.250000 ( 0.391236) ruby 2.7.7p221
require 800 0.078000 0.156000 0.234000 ( 0.391100) ruby 3.0.5p211
require 800 0.031000 0.484000 0.515000 ( 0.664927) ruby 3.1.0p0
require 800 0.109000 0.391000 0.500000 ( 0.651035) ruby 3.1.3p185
require 800 0.062000 0.406000 0.468000 ( 0.704620) ruby 3.3.0dev
Note: Ruby master timing is similar for mingw, ucrt, & mswin builds
```
WSL2/Ubuntu
```
user system total real
ruby 2.7.7p221 (2022-11-24 revision 168ec2b1e5) [x86_64-linux]
normal 0.001399 0.002799 0.004198 ( 0.004197)
loaded features 0.065028 0.000000 0.065028 ( 0.065073)
normal again 0.004481 0.000000 0.004481 ( 0.004482)
ruby 3.0.4p208 (2022-04-12 revision 3fa771dded) [x86_64-linux]
normal 0.004395 0.000000 0.004395 ( 0.004394)
loaded features 0.065669 0.000000 0.065669 ( 0.065717)
normal again 0.004371 0.000000 0.004371 ( 0.004371)
ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-linux]
normal 0.006511 0.000000 0.006511 ( 0.006505)
loaded features 0.189599 0.138964 0.328563 ( 0.328602)
normal again 0.004792 0.002796 0.007588 ( 0.007588)
ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
normal 0.004290 0.001430 0.005720 ( 0.005719)
loaded features 0.098113 0.210443 0.308556 ( 0.308597)
normal again 0.006900 0.000000 0.006900 ( 0.006899)
ruby 3.3.0dev (2023-02-27T21:34:27Z master ba55706fb6) [x86_64-linux]
normal 0.003708 0.001236 0.004944 ( 0.004942)
loaded features 0.118627 0.160026 0.278653 ( 0.278693)
normal again 0.000000 0.006377 0.006377 ( 0.006378)
user system total real
require 800 0.017006 0.000000 0.017006 ( 0.017004) ruby 2.7.7p221
require 800 0.016817 0.000000 0.016817 ( 0.016819) ruby 3.0.4p208
require 800 0.023295 0.000000 0.023295 ( 0.023295) ruby 3.1.0p0
require 800 0.020107 0.000000 0.020107 ( 0.020106) ruby 3.1.3p185
require 800 0.009945 0.009533 0.019478 ( 0.019476) ruby 3.3.0dev
```
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-102082
* Author: thomthom (Thomas Thomassen)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
12 Apr
12 Apr
3:42 p.m.
New subject: [ruby-core:113197] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by jeremyevans0 (Jeremy Evans).
Since @matz asked for an update and I won't be able to attend the dev meeting, my
understanding is that rebuilding the loaded feature index is much slower in Ruby 3.1+,
because realpaths are calculated for every loaded feature every time the loaded feature
index is rebuilt. This was done to fix #17885.
I didn't consider this a major issue at the time, because in general, the loaded
feature index does not need to be rebuilt unless `$LOADED_FEATURES` is mutated, and it
shouldn't be during normal use. Also, the slowdown is not that dramatic on platforms
supporting `realpath` function. It's only very bad on platforms that are also
emulating `realpath` (`realpath` emulation is quite slow).
One possible optimization I haven't tried yet is using the previous
`vm->loaded_features_realpaths` hash when rebuilding the loaded feature index.
Basically, first try looking at the previous hash for the realpath, and if it is found
there, assume the realpath has not changed. If the realpath doesn't exist in the
previous hash, then try to calculate it. I'll see if I have time today to test that.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-102738
* Author: thomthom (Thomas Thomassen)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
9:01 p.m.
New subject: [ruby-core:113200] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by jeremyevans0 (Jeremy Evans).
jeremyevans0 (Jeremy Evans) wrote in #note-4:
One possible optimization I haven't tried yet is
using the previous `vm->loaded_features_realpaths` hash when rebuilding the loaded
feature index. Basically, first try looking at the previous hash for the realpath, and if
it is found there, assume the realpath has not changed. If the realpath doesn't exist
in the previous hash, then try to calculate it. I'll see if I have time today to test
that.
I wasn't able to use this approach, since the hash needs to map loaded feature paths
to realpaths (and `vm->loaded_features_realpaths` does not do that), but I was able to
add a new hash that does that, and significantly improves performance even when `realpath`
is not emulated. I submitted a pull request for it:
https://github.com/ruby/ruby/pull/7699
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-102741
* Author: thomthom (Thomas Thomassen)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
14 Apr
14 Apr
2:25 p.m.
New subject: [ruby-core:113255] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by MSP-Greg (Greg L).
@jeremyevans0
Thank you for working on this. Refreshed data:
```
ruby 2.7.8p225 (2023-03-30 revision 1f4d455848) [x64-mingw32]
user system total real
normal 0.015000 0.078000 0.093000 ( 0.103699)
loaded features 0.078000 0.078000 0.156000 ( 0.157629)
normal again 0.016000 0.063000 0.079000 ( 0.100165)
ruby 3.0.6p216 (2023-03-30 revision 23a532679b) [x64-mingw32]
user system total real
normal 0.031000 0.047000 0.078000 ( 0.102176)
loaded features 0.078000 0.062000 0.140000 ( 0.155943)
normal again 0.000000 0.094000 0.094000 ( 0.098305)
ruby 3.1.4p223 (2023-03-30 revision 957bb7cb81) [x64-mingw-ucrt]
user system total real
normal 0.016000 0.125000 0.141000 ( 0.167011)
loaded features 4.672000 24.125000 28.797000 ( 31.891813)
normal again 0.093000 0.266000 0.359000 ( 0.369579)
ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x64-mingw-ucrt]
user system total real
normal 0.047000 0.110000 0.157000 ( 0.173098)
loaded features 5.141000 23.828000 28.969000 ( 31.793334)
normal again 0.062000 0.297000 0.359000 ( 0.369032)
ruby 3.3.0dev (2023-04-14T08:07:33Z master 6c1b604e29) [x64-mingw-ucrt]
user system total real
normal 0.000000 0.141000 0.141000 ( 0.162872)
loaded features 0.078000 0.203000 0.281000 ( 0.298789)
normal again 0.031000 0.125000 0.156000 ( 0.164640)
```
Ruby master is approx two orders of magnitude faster than Ruby 3.1 & 3.2. A bit
slower than Ruby 2.7 and 3.0, but well within acceptable results.
I assume this will be backported to Ruby 3.1 & 3.2?
Thanks again.
Greg
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-102811
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
3:42 p.m.
New subject: [ruby-core:113257] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by jeremyevans0 (Jeremy Evans).
Backport changed from 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN to 3.0: DONTNEED, 3.1:
REQUIRED, 3.2: REQUIRED
I've updated the backport flags for this issue. However, as always, it is up to the
branch maintainer whether or not to backport.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-102813
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
17 Apr
17 Apr
11:18 a.m.
New subject: [ruby-core:113274] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by thomthom (Thomas Thomassen).
Thank you very much for looking into this. We'll be testing the patch to see how the
performance is with our application in our, somewhat special use case.
I got a follow up question: As mentioned, the reason why we modify `$LOADED_FEATURES` is
because we provide our own `require` method for encrypted source code. But the current API
`rb_provide` isn't ideal for this scenario. Partly because the string passed in needs
to always live. The other is that for our reloading functionality we need to remove items
from this array. If we could use C API methods designed to add/remove to this array
without needing to rebuild the cache that'd give us some very nice performance boosts.
And make our logic more robust.
Is this something that could be considered? (Maybe best if I log a separate ticket for
this topic?)
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-102835
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
2:41 p.m.
New subject: [ruby-core:113277] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by jeremyevans0 (Jeremy Evans).
thomthom (Thomas Thomassen) wrote in #note-9:
Is this something that could be considered? (Maybe
best if I log a separate ticket for this topic?)
It would be best to log a separate issue stating what your use case is, and what you
proposed feature is for fixing it. Even better if you can come up with a proposed patch.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-102838
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
4:07 p.m.
New subject: [ruby-core:113279] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by byroot (Jean Boussier).
But the current API rb_provide isn't ideal for
this scenario. Partly because the string passed in needs to always live.
For what it's worth, I just checked the current version of `rb_provide` and it uses
`rb_fstring_cstr()` which does end up copying the `char *`. I'm not sure which version
exactly caused you issues, but I think you could go back to use `rb_provide` again.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-102839
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
21 Jun
21 Jun
2:13 p.m.
New subject: [ruby-core:113971] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by MSP-Greg (Greg L).
Could this get backported to 3.1 & 3.2?
See:
https://github.com/ruby/ruby/pull/7699
https://github.com/ruby/ruby/commit/61b974629e3571
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-103628
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
29 Jul
29 Jul
5:28 a.m.
New subject: [ruby-core:114306] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by nagachika (Tomoyuki Chikanaga).
Backport changed from 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED to 3.0: DONTNEED, 3.1:
REQUIRED, 3.2: DONE
Thank you for creating a backport patch and pull request. Merged into ruby_3_2.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-104006
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: DONE
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
9:01 a.m.
New subject: [ruby-core:114308] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by nagachika (Tomoyuki Chikanaga).
Backport changed from 3.0: DONTNEED, 3.1: REQUIRED, 3.2: DONE to 3.0: DONTNEED, 3.1:
REQUIRED, 3.2: REQUIRED
I have reverted the backport at
https://github.com/ruby/ruby/commit/1c7624469880bcb964be09a49e4907873f45b026.
It seems break CI on MinGW.
https://github.com/ruby/ruby/actions/runs/5698775895/job/15447455988
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-104008
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
19 Aug
19 Aug
7:47 p.m.
New subject: [ruby-core:114415] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by MSP-Greg (Greg L).
@nagachika
Thanks for your work on this. Please see https://github.com/ruby/ruby/pull/8252
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-104164
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
20 Aug
20 Aug
12:28 a.m.
New subject: [ruby-core:114416] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by nagachika (Tomoyuki Chikanaga).
@MSP-Greg Thank you for investigations and providing patches! I will handle it soon.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-104165
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
21 Aug
21 Aug
11:36 p.m.
New subject: [ruby-core:114424] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by nagachika (Tomoyuki Chikanaga).
Backport changed from 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED to 3.0: DONTNEED, 3.1:
REQUIRED, 3.2: DONE
Applied at https://github.com/ruby/ruby/commit/788b03d5ba82fd8b35ce1fe2618ce6bacc648333.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-104173
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: DONE
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
5 Sep
5 Sep
11:51 a.m.
New subject: [ruby-core:114633] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by usa (Usaku NAKAMURA).
Backport changed from 3.0: DONTNEED, 3.1: REQUIRED, 3.2: DONE to 3.0: DONTNEED, 3.1: DONE,
3.2: DONE
ruby_3_1 8a8d889ca2ba1ace8784e49e02a6616dd5765d9e merged revision(s)
1f115f141dd17f75049a5e17107906c5bcc372e1.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-104461
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: DONE, 3.2: DONE
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
17 Nov
17 Nov
2:18 a.m.
New subject: [ruby-core:115406] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by nagachika (Tomoyuki Chikanaga).
Backport changed from 3.0: DONTNEED, 3.1: DONE, 3.2: DONE to 3.0: DONTNEED, 3.1: DONE,
3.2: REQUIRED
I will fill Backport field with "3.2: REQUIRED" according to the comments in
https://github.com/ruby/ruby/pull/8275. I will retry to backport to ruby_3_2.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-105342
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: DONE, 3.2: REQUIRED
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
19 Nov
19 Nov
12:24 p.m.
New subject: [ruby-core:115420] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by nagachika (Tomoyuki Chikanaga).
Backport changed from 3.0: DONTNEED, 3.1: DONE, 3.2: REQUIRED to 3.0: DONTNEED, 3.1: DONE,
3.2: DONE
ruby_3_2 5baf94f9131fb45d50c8c408e007a138ced46606 merged revision(s)
1f115f141dd17f75049a5e17107906c5bcc372e1.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-105352
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: DONE, 3.2: DONE
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
17 Jan
17 Jan
12:17 p.m.
New subject: [ruby-core:116272] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by thomthom (Thomas Thomassen).
byroot (Jean Boussier) wrote in #note-11:
The comment for `rb_fstring_cstr`:
```
rb_fstring_new and rb_fstring_cstr family create or lookup a frozen
* shared string which refers a static string literal. `ptr` must
* point a constant string.
```
https://github.com/ruby/ruby/blob/c68ce6f7f5e6020409cfe689ba5946f284828d4b/…
That doesn't sound like it's doing a copy. It's expecting a static string
literal. Which is why we ran into issue when we were providing non-static strings.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-106294
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: DONE, 3.2: DONE
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
But the
current API rb_provide isn't ideal for this scenario. Partly because the string passed
in needs to always live.
For what it's worth, I just checked the current version of `rb_provide` and it uses
`rb_fstring_cstr()` which does end up copying the `char *`. I'm not sure which version
exactly caused you issues, but I think you could go back to use `rb_provide` again.
12:22 p.m.
New subject: [ruby-core:116273] [Ruby master Bug#19246] Rebuilding the loaded feature index much slower in Ruby 3.1
Issue #19246 has been updated by byroot (Jean Boussier).
That doesn't sound like it's doing a copy.
My mad, you are right, I missed the `copy` argument is passed as false.
Honestly I think we could change that. Feature names are generally small, it wouldn't
be a noticeable performance degradation to assume the `char *` isn't constant and to
always copy it.
----------------------------------------
Bug #19246: Rebuilding the loaded feature index much slower in Ruby 3.1
https://bugs.ruby-lang.org/issues/19246#change-106295
* Author: thomthom (Thomas Thomassen)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: DONE, 3.2: DONE
----------------------------------------
Some background to this issue: (This is a case that is unconventional usage of Ruby, but I
hope you bear with me.)
We ship the Ruby interpreter with our desktop applications for plugin support in our
application (SketchUp).
One feature we have had since, at least 2006 (maybe earlier-hard to track history beyond
that) is that we had a custom alternate `require` method: `Sketchup.require`. This allows
the users of our API to load encrypted Ruby files.
This originally used `rb_provide` to add the path to the encrypted file into the list of
loaded feature. However, somewhere between Ruby 2.2 and 2.5 there was some string
optimisations made and the function `rb_provide` would not use a copy of the string passed
to it. Instead it just held on to a pointer reference. In our case that string came from
user-land, being passed in from `Sketchup.require` and would eventually be garbage
collected and cause access violation crashes.
To work around that we changed our custom `Sketchup.require` to push to `$LOADED_FEATURES`
directly. There was a small penalty to the index being rebuilt after that, but it was
negligible.
Recently we tried to upgrade the Ruby interpreter in our application from 2.7 to 3.1 and
found a major performance reduction when using our `Sketchup.require. As in, a plugin that
would load in half a second would now spend 30 seconds.
From https://bugs.ruby-lang.org/issues/18452 it sounds like there is _some_ expected extra
penalty due to changes in how the index is built. But should it really be this much?
Example minimal repro to simulate the issue:
```
# frozen_string_literal: true
require 'benchmark'
iterations = 200
foo_files = iterations.times.map { |i| "#{__dir__}/tmp/foo-#{i}.rb" }
foo_files.each { |f| File.write(f, "") }
bar_files = iterations.times.map { |i| "#{__dir__}/tmp/bar-#{i}.rb" }
bar_files.each { |f| File.write(f, "") }
biz_files = iterations.times.map { |i| "#{__dir__}/tmp/biz-#{i}.rb" }
biz_files.each { |f| File.write(f, "") }
Benchmark.bm do |x|
x.report('normal') {
foo_files.each { |file|
require file
}
}
x.report('loaded_features') {
foo_files.each { |file|
require file
$LOADED_FEATURES << "#{file}-fake.rb"
}
}
x.report('normal again') {
biz_files.each { |file|
require file
}
}
end
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby27.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.078483)
loaded_features 0.015000 0.000000 0.015000 ( 0.038759)
normal again 0.016000 0.032000 0.048000 ( 0.076940)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby30.bat
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x64-mingw32]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.000000 0.031000 0.031000 ( 0.074733)
loaded_features 0.032000 0.000000 0.032000 ( 0.038898)
normal again 0.000000 0.047000 0.047000 ( 0.076343)
```
```
C:\Users\Thomas\SourceTree\ruby-perf>ruby31.bat
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x64-mingw-ucrt]
C:\Users\Thomas\SourceTree\ruby-perf>ruby test-require.rb
user system total real
normal 0.016000 0.031000 0.047000 ( 0.132633)
loaded_features 1.969000 11.500000 13.469000 ( 18.395761)
normal again 0.031000 0.125000 0.156000 ( 0.249130)
```
Right now we're exploring options to deal with this. Because the performance
degradation is a blocker for us upgrading. We also have 16 years of plugins created by
third party developer that makes it impossible for us to drop this feature.
Some options as-is, none of which are ideal:
1. We revert to using `rb_provide` but ensure the string passed in is not owned by Ruby,
instead building a list of strings that we keep around for the duration of the application
process. The problem is that some of our plugin developers have on occasion released
plugins that will touch `$LOADED_FEATURES`, and if such a plugin is installed on a user
machine it might cause the application to become unresponsive for minutes. The other
non-ideal issue with using `rb_provide` is that we're also using that in ways it
wasn't really intended (from that I understand). And it's not an official API?
2. We create a separate way for our `Sketchup.require` to keep track of it's loaded
features, but then that would diverge even more from the behaviour of `require`.
Replicating `require` functionality is not trivial and would be prone to subtle errors and
possible diverge. It also doesn't address our issue that there is code out there in
existing plugins that touches `$LOADED_FEATURES`. (And it's not something we can just
ask people to clean up. From previous experience old versions stick around for a long time
and is very hard to purge from circulation.)
I have two questions for the Ruby mantainers:
1. Would it be reasonable to see an API for adding/removing/checking `$LOADED_FEATURE`
that would allow for a more ideal implementation of a custom `require` functionality?
2. Is the performance difference in rebuilding the loaded feature index really expected to
be as high as what we're seeing? An increase of nearly 100 times? Is there something
there that might be addressed to make the rebuild to be less expensive against? (This
would really help to address our challenges with third party plugins occasionally touching
the global.)
--
https://bugs.ruby-lang.org/
101
days inactive
494
days old
21 comments
9 participants
participants (9)
-
byroot (Jean Boussier) -
byroot (Jean Boussier) -
jeremyevans0 (Jeremy Evans)
-
MSP-Greg (Greg L)
-
MSP-Greg (Greg L)
-
nagachika (Tomoyuki Chikanaga)
-
thomthom (Thomas Thomassen)
-
thomthom (Thomas Thomassen)
-
usa (Usaku NAKAMURA)