24 Jan
2023
24 Jan
'23
11:31 a.m.
Issue #19288 has been updated by Eregon (Benoit Daloze).
maciej.mensfeld (Maciej Mensfeld) wrote in #note-4:
I find this issue important and if mitigated, it would
allow me to release production-grade functionalities that would benefit users of the Ruby
language.
Note that Ractor is far from production-ready.
It has many issues as can be found on this bug tracker and when using it and as the
warning says (`Also there are many implementation issues.`).
Also the fact that the main Ruby test suites don't run any Ractor test in the same
process also seems an indication of instability.
And then of course there is the issue that Ractor is incompatible with most gems/code out
there.
While JSON loading might work, any non-trivial processing after using a gem is unlikely to
work well.
Other Rubies have solved this in a much more efficient, usable and reliable way, by having
no GVL.
----------------------------------------
Bug #19288: Ractor JSON parsing significantly slower than linear parsing
https://bugs.ruby-lang.org/issues/19288#change-101436
* Author: maciej.mensfeld (Maciej Mensfeld)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
a simple benchmark:
```ruby
require 'json'
require 'benchmark'
CONCURRENT = 5
RACTORS = true
ELEMENTS = 100_000
data = CONCURRENT.times.map do
ELEMENTS.times.map do
{
rand => rand,
rand => rand,
rand => rand,
rand => rand
}.to_json
end
end
ractors = CONCURRENT.times.map do
Ractor.new do
Ractor.receive.each { JSON.parse(_1) }
end
end
result = Benchmark.measure do
if RACTORS
CONCURRENT.times do |i|
ractors[i].send(data[i], move: false)
end
ractors.each(&:take)
else
# Linear without any threads
data.each do |piece|
piece.each { JSON.parse(_1) }
end
end
end
puts result
```
Gives following results on my 8 core machine:
```shell
# without ractors:
2.731748 0.003993 2.735741 ( 2.736349)
# with ractors
12.580452 5.089802 17.670254 ( 5.209755)
```
I would expect Ractors not to be two times slower on the CPU intense work.
--
https://bugs.ruby-lang.org/