July 2023 - ruby-core - ml.ruby-lang.org

[ruby-core:114149] [Ruby master Bug#18572] Performance regression when invoking refined methods
by shugo (Shugo Maeda) 13 Jul '23

13 Jul '23

Issue #18572 has been updated by shugo (Shugo Maeda). shugo (Shugo Maeda) wrote in #note-10: > Eregon (Benoit Daloze) wrote in #note-9: > > From https://bugs.ruby-lang.org/issues/14083#note-3 it seems part of the problem at least is CRuby currently implements what I would call invalid usages of refinements (different set of activates refinements over time for a given call site), and that basically means extra checks and overhead, e.g., for a method which was refined once, even if there are no refinements active in the current scope. > > If it's needed to fix the performance issue, it may be acceptable to raise exceptions in some cases (but I don't know the exact condition of such cases). > @ko1, @matz What do you think? > > It's simple to prohibit using calls in blocks, but it will break backward compatibility, e.g., using in module_eval. I and @ko1 discussed it at today's developer meeting, and concluded that there is no need to change the behavior to fix the performance regression. @eregon Could you create another issue if you would like to change the behavior? ---------------------------------------- Bug #18572: Performance regression when invoking refined methods https://bugs.ruby-lang.org/issues/18572#change-103827 * Author: palkan (Vladimir Dementyev) * Status: Assigned * Priority: Normal * Assignee: ko1 (Koichi Sasada) * Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- Since Ruby 3.0, defining a refinement for a method slows down its execution even if we do not activate the refinement: ```ruby require "benchmark_driver" source = <<~RUBY class Hash def symbolize_keys transform_keys { |key| key.to_sym rescue key } end def refined_symbolize_keys transform_keys { |key| key.to_sym rescue key } end end module HashRefinements refine Hash do def refined_symbolize_keys raise "never called" end end end HASH = {foo: 1, bar: 2, baz: 3} class Foo def original end def refined end end module FooRefinements refine Foo do def refined raise "never called" end end end FOO = Foo.new RUBY Benchmark.driver do |x| x.prelude %Q{ #{source} } x.report "#symbolize_keys original", %{ HASH.symbolize_keys } x.report "#symbolize_keys refined", %{ HASH.refined_symbolize_keys } end Benchmark.driver do |x| x.prelude %Q{ #{source} } x.report "no-op original", %{ FOO.original } x.report "no-op refined", %{ FOO.refined } end ``` The results for Ruby 3.1: ```sh ... Comparison: #symbolize_keys original: 2372420.1 i/s #symbolize_keys refined: 1941019.0 i/s - 1.22x slower ... Comparison: no-op original: 51790974.2 i/s no-op refined: 14456518.9 i/s - 3.58x slower ``` For Ruby 2.6 and 2.7: ```sh Comparison: #symbolize_keys original: 2278339.7 i/s #symbolize_keys refined: 2264153.1 i/s - 1.01x slower ... Comparison: no-op refined: 64178338.5 i/s no-op original: 63357980.1 i/s - 1.01x slower ``` You can find the full code and more results in this [gist](https://gist.github.com/palkan/637dc83edd86d70b5dbf72f2a4d702e5). P.S. The problem was originally noticed by @byroot, see https://github.com/ruby-i18n/i18n/pull/573 -- https://bugs.ruby-lang.org/

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[ruby-core:113693] [Ruby master Feature#19698] Need an idiomatic way to define an empty range
by shouichi (Shouichi KAMIYA) 12 Jul '23

12 Jul '23

Issue #19698 has been reported by shouichi (Shouichi KAMIYA). ---------------------------------------- Feature #19698: Need an idiomatic way to define an empty range https://bugs.ruby-lang.org/issues/19698 * Author: shouichi (Shouichi KAMIYA) * Status: Open * Priority: Normal ---------------------------------------- It seems there is no idiomatic way to define an empty range. We can define empty ranges in several ways such as ``` ruby irb(main):001:0> (0...0).none? => true irb(main):002:0> (1...-1).none? => true ``` I think the above examples do not communicate the intention well. -- https://bugs.ruby-lang.org/

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[ruby-core:113899] [Ruby master Feature#19730] Remove transient heap
by peterzhu2118 (Peter Zhu) 11 Jul '23

11 Jul '23

Issue #19730 has been reported by peterzhu2118 (Peter Zhu). ---------------------------------------- Feature #19730: Remove transient heap https://bugs.ruby-lang.org/issues/19730 * Author: peterzhu2118 (Peter Zhu) * Status: Open * Priority: Normal ---------------------------------------- GitHub PR: https://github.com/ruby/ruby/pull/7942 I'm proposing to remove the transient heap because Variable Width Allocation now supports all the types that were on the transient heap. Arrays, objects, hashes, and structs were on the transient heap. After Variable Width Allocation: - Arrays: allocated on the transient heap for very large arrays (>78 elements) or when elements are added and is too big for embedded. - Objects: allocated on the transient heap for very large objects (>78 instance variables) or when new instance variables are added and is too big for embedded. However, classes store an estimate of the number of instance variables objects will have, which means that objects are usually allocated with the correct capacity. - Hashes: no longer on the transient heap. - Structs: allocated on the transient heap for very large structs (>78 elements). As such, the cases where allocations are on the transient heap become rarer and thus no longer provide the performance benefits it once did. This is supported by the benchmark results below, where we see no performance change with the transient heap removed. However, we do see around a 5-10% decrease in memory usage for most benchmarks. ``` -------------- ----------- ---------- --------- ---------------------- ---------- --------- ------------------------- ------------------------ bench master (ms) stddev (%) RSS (MiB) no transient heap (ms) stddev (%) RSS (MiB) no transient heap 1st itr master/no transient heap activerecord 71.9 2.4 58.2 71.9 2.2 53.4 1.00 1.00 chunky_png 822.7 0.2 45.7 837.0 0.2 47.4 0.98 0.98 erubi_rails 20.5 13.5 95.1 20.3 13.3 90.6 1.00 1.01 hexapdf 2525.8 0.7 173.1 2546.9 0.8 162.4 1.00 0.99 liquid-c 66.2 0.8 38.4 65.9 0.2 34.3 1.01 1.00 liquid-compile 60.2 1.7 36.6 60.4 1.4 32.6 1.02 1.00 liquid-render 165.0 0.2 37.2 164.7 0.2 33.1 1.01 1.00 mail 138.4 0.1 50.4 136.6 0.2 46.5 1.03 1.01 optcarrot 5232.2 0.7 62.9 5151.2 0.7 58.6 1.00 1.02 psych-load 2082.8 0.1 37.1 2059.4 0.1 32.2 1.01 1.01 railsbench 2066.2 0.1 103.6 2051.7 0.4 99.3 1.01 1.01 ruby-lsp 6.4 6.5 45.8 6.4 6.2 41.4 1.01 0.99 sequel 73.0 1.1 40.5 73.1 1.0 36.1 1.00 1.00 -------------- ----------- ---------- --------- ---------------------- ---------- --------- ------------------------- ------------------------ ``` -- https://bugs.ruby-lang.org/

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[ruby-core:112988] [Ruby master Bug#19544] Custom quotes inconsistency
by hurricup (Alexandr Evstigneev) 11 Jul '23

11 Jul '23

Issue #19544 has been reported by hurricup (Alexandr Evstigneev). ---------------------------------------- Bug #19544: Custom quotes inconsistency https://bugs.ruby-lang.org/issues/19544 * Author: hurricup (Alexandr Evstigneev) * Status: Open * Priority: Normal * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- According to `parse_percent` in `parse.y`: For `%` we should be able use ascii non alphanumeric delimiters. But, `p % jim beam ;` does not work. Presumably because of some look-ahead distincting `%` from percent-string starter. Seems it is the same for any `\s` after `%` For the explicit `%` construction, with type specifier `%[QqWwIisrx]` we should be able to use non-alphanumeric ascii characters, which includes `\s`. But: This works: ``` p %s jim beam ``` And this does not: ``` p %w jim\ beam ``` with unterminated list error. First seems unavoidable, but second looks like obvious error of finding terminating `\n` -- https://bugs.ruby-lang.org/

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[ruby-core:113898] [Ruby master Feature#19729] Store object age in a bitmap
by eightbitraptor (Matthew Valentine-House) 11 Jul '23

11 Jul '23

Issue #19729 has been reported by eightbitraptor (Matthew Valentine-House). ---------------------------------------- Feature #19729: Store object age in a bitmap https://bugs.ruby-lang.org/issues/19729 * Author: eightbitraptor (Matthew Valentine-House) * Status: Open * Priority: Normal ---------------------------------------- ## Github PR [Store object age in a bitmap #7938](https://github.com/ruby/ruby/pull/7938) ## Abstract Ruby currently uses 2 bits of the flags in every object to track how many GC events the object has survived. Objects are created at age 0 and can currently grow to age 3, at which point they are considered "old". Similar to the work carried out for [bitmap marking in Ruby 2.0](https://bugs.ruby-lang.org/issues/5839) which moved the mark bit from the flags to a bitmap attached to a heap page; This PR moves the age bits out of the object flags and stores them in a bitmap. ## Description This PR creates a new bitmap `age_bits` on each heap page. the size of the bitmap is controlled by `HEAP_PAGE_BITMAP_LIMIT`, which roughly indicates how many objects need to be considered by that bitmap, and `RVALUE_AGE_BITS_SIZE` which varies how many bits we use per object to store the age. We also introduce functions `RVALUE_AGE_SET`, `RVALUE_AGE_GET`, `RVALUE_AGE_RESET` and `RVALUE_AGE_INC` to manipulate the age of an object pointed to by a VALUE. ## Impact **Benefits:** * Improved CoW performance, because GC no longer has to mutate the object header for objects that age. * Allow configuration of the age at which objects are considered old. Because the number of bits used is configurable, we can support arbitrary numbers of GC events before an object is considered old. We can use this to change major/minor GC timings for workloads with unusually high/low object churn. * Free a flag in each object that can be repurposed. Object flags are a precious resource, we should prefer to store data outside the flags where possible. * Remove GC related concerns from the object structure. This is important for initiatives like a generic GC interface and MMTk in order to keep GC related code as isolated as possible. **Concerns:** * Slightly increased RSS, because we now allocate an extra 2 bits per heap page slot, to create the age_bits bitmap on VM bootup. On my machine `sizeof(struct heap_page)` has increased from 1312 to 1728 bytes. ## Benchmarking Railsbench and Optcarrot benchmarked using `yjit-bench`. Showing small memory increase, but comparable performance. ``` master: ruby 3.3.0dev (2023-06-08T11:22:43Z master 3fe09eba9d) [x86_64-linux] mvh-rvalue-age-bitmap: ruby 3.3.0dev (2023-06-13T06:59:40Z master c74f42a4fb) [x86_64-linux] ---------- ----------- ---------- --------- -------------------------- ---------- --------- ----------------------------- ---------------------------- bench master (ms) stddev (%) RSS (MiB) mvh-rvalue-age-bitmap (ms) stddev (%) RSS (MiB) mvh-rvalue-age-bitmap 1st itr master/mvh-rvalue-age-bitmap railsbench 2154.3 0.5 101.4 2124.9 0.5 101.5 1.01 1.01 optcarrot 5372.2 0.6 55.0 5282.3 0.6 55.1 1.02 1.02 ---------- ----------- ---------- --------- -------------------------- ---------- --------- ----------------------------- ---------------------------- Legend: - mvh-rvalue-age-bitmap 1st itr: ratio of master/mvh-rvalue-age-bitmap time for the first benchmarking iteration. - master/mvh-rvalue-age-bitmap: ratio of master/mvh-rvalue-age-bitmap time. Higher is better for mvh-rvalue-age-bitmap. Above 1 represents a speedup. ``` ## Notes **FL_PROMOTED** We still use one of the two age bits. The original `FL_PROMOTED0` has been renamed to `FL_PROMOTED` and has been repurposed to indicate an objects old/young status. We need this because correctly tracking references from old to young objects relies on a write barrier, that's triggered whenever a field on an object is written to. Because this code is a very hot path it needs to be fast. Looking up the heap page and then calculating the old/young status based on the age bits would slow down this part of the code too much. Instead we set `FL_PROMOTED` whenever the object crosses the threshold into the old gen, and unset it if that object ever gets demoted back into the young gen. This way the write barrier can quickly tell whether the object is old or not and whether to add it to the rememberset. **rb_age_reset** I expose a function from gc.c to reset the object age. This is only used from one place: `Init_VM` in `vm.c`. We create a hidden class during boot for the VM's "Frozen Core". This is created using `rb_class_new` as a T_CLASS, then it has it's class path set, and then the flags are overwritten, forcing the type to T_ICLASS. Classes are allocated with age 2, and `rb_set_class_path` allocates, which may trigger GC. If this happens then the class will immediately become old, and have its `FL_PROMOTED` bit set. This will then be immediately wiped over when the flags are forced to T_ICLASS. This will result in the `FL_PROMOTED` bit and the object age being out of sync. I don't know why this code is using `rb_class_new` rather than `rb_include_class_new` but I will follow up this PR with an investigation. -- https://bugs.ruby-lang.org/

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[ruby-core:114126] Password for ruby-core@ruby-lang.org expires soon from Today 7/11/2023 5:13:20 a.m.
by noreply＠ruby-lang.org 11 Jul '23

11 Jul '23

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[ruby-core:113835] [Ruby master Misc#19722] DevMeeting-2023-07-13
by mame (Yusuke Endoh) 10 Jul '23

10 Jul '23

Issue #19722 has been reported by mame (Yusuke Endoh). ---------------------------------------- Misc #19722: DevMeeting-2023-07-13 https://bugs.ruby-lang.org/issues/19722 * Author: mame (Yusuke Endoh) * Status: Open * Priority: Normal ---------------------------------------- # The next dev meeting **Date: 2023/07/13 13:00-17:00** (JST) Log: *TBD* - Dev meeting *IS NOT* a decision-making place. All decisions should be done at the bug tracker. - Dev meeting is a place we can ask Matz, nobu, nurse and other developers directly. - Matz is a very busy person. Take this opportunity to ask him. If you can not attend, other attendees can ask instead of you (if attendees can understand your issue). - We will write a record of the discussion in the file or to each ticket in English. - All activities are best-effort (keep in mind that most of us are volunteer developers). - The date, time and place of the meeting are scheduled according to when/where we can reserve Matz's time. - *DO NOT* discuss then on this ticket, please. # Call for agenda items If you have a ticket that you want matz and committers to discuss, please post it into this ticket in the following format: ``` * [Ticket ref] Ticket title (your name) * Comment (A summary of the ticket, why you put this ticket here, what point should be discussed, etc.) ``` Example: ``` * [Feature #14609] `Kernel#p` without args shows the receiver (ko1) * I feel this feature is very useful and some people say :+1: so let discuss this feature. ``` - It is recommended to add a comment by 2023/07/10. We hold a preparatory meeting to create an agenda a few days before the dev-meeting. - The format is strict. We'll use [this script to automatically create an markdown-style agenda](https://gist.github.com/mame/b0390509ce1491b43610b9ebb665eb86). We may ignore a comment that does not follow the format. - Your comment is mandatory. We cannot read all discussion of the ticket in a limited time. We appreciate it if you could write a short summary and update from a previous discussion. -- https://bugs.ruby-lang.org/

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[ruby-core:114115] [Ruby master Bug#19762] rubyspec refers wrongly ruby version instead of gem versions
by nobu (Nobuyoshi Nakada) 10 Jul '23

10 Jul '23

Issue #19762 has been reported by nobu (Nobuyoshi Nakada). ---------------------------------------- Bug #19762: rubyspec refers wrongly ruby version instead of gem versions https://bugs.ruby-lang.org/issues/19762 * Author: nobu (Nobuyoshi Nakada) * Status: Open * Priority: Normal * Assignee: Eregon (Benoit Daloze) * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- ```shell-session $ git grep ruby_version_is spec/ruby/library/ | grep -F -v -e /rbconfig/ -e /objectspace/ -e /coverage/ -e /fiber/ | wc -l 193 ``` Libraries under this directory, except for libraries excluded with `grep -v` in the above, are standard or bundled gems, and their own versions, and `RUBY_VERSION` is unrelated to them. `version_is` must be used under the directory instead of `ruby_version_is`, for example: ``` spec/ruby/library/bigdecimal/remainder_spec.rb:57: version_is BigDecimal::VERSION, ""..."3.1.4" do spec/ruby/library/datetime/to_time_spec.rb:22: version_is(date_version, '3.2.3') do spec/ruby/library/logger/device/close_spec.rb:18: version_is Logger::VERSION, ""..."1.4.0" do spec/ruby/library/logger/device/close_spec.rb:25: version_is Logger::VERSION, "1.4.0" do spec/ruby/library/logger/device/write_spec.rb:38: version_is Logger::VERSION, ""..."1.4.0" do spec/ruby/library/logger/device/write_spec.rb:45: version_is Logger::VERSION, "1.4.0" do spec/ruby/library/matrix/unitary_spec.rb:17: version_is((Matrix::const_defined?(:VERSION) ? Matrix::VERSION : "0.1.0"), "0.3.0") do spec/ruby/library/openssl/config/freeze_spec.rb:6:version_is(OpenSSL::VERSION, ""..."2.2") do spec/ruby/library/stringio/initialize_spec.rb:299: version_is(stringio_version, "0.0.3"..."0.1.1") spec/ruby/library/time/to_datetime_spec.rb:17: version_is(date_version, '3.2.3') do ``` -- https://bugs.ruby-lang.org/

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[ruby-core:114119] [Ruby master Bug#19763] Inconsistent error message for String#index vs String#rindex
by itarato (Peter Arato) 08 Jul '23

08 Jul '23

Issue #19763 has been reported by itarato (Peter Arato). ---------------------------------------- Bug #19763: Inconsistent error message for String#index vs String#rindex https://bugs.ruby-lang.org/issues/19763 * Author: itarato (Peter Arato) * Status: Open * Priority: Normal * ruby -v: 3.3.0 * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- `String#index` and `String#rindex` yields different error messages when used with a `Regexp` argument: ```ruby 'abc'.force_encoding("ISO-2022-JP").index(/わ/) ``` Prints: `incompatible character encodings: ISO-2022-JP and UTF-8 (Encoding::CompatibilityError)` ```ruby 'abc'.force_encoding("ISO-2022-JP").rindex(/わ/) ``` Prints: `incompatible encoding regexp match (UTF-8 regexp with ISO-2022-JP string) (Encoding::CompatibilityError)` Looking at a few other use cases (eg `String#byteindex`, `String#byterindex`) Ruby seems to use the message `incompatible encoding regexp match ` when encoding is checked between a String and a Regexp instance. Is this a bug for `String#index`? -- https://bugs.ruby-lang.org/

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[ruby-core:114108] [Ruby master Bug#19760] Marshal.load Segmentation fault in ruby 2.2.10 aarch64
by lijian＠zdns.cn (jian li) 07 Jul '23

07 Jul '23

Issue #19760 has been reported by lijian(a)zdns.cn (jian li). ---------------------------------------- Bug #19760: Marshal.load Segmentation fault in ruby 2.2.10 aarch64 https://bugs.ruby-lang.org/issues/19760 * Author: lijian(a)zdns.cn (jian li) * Status: Open * Priority: Normal * ruby -v: 2.2.10 * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- irb(main):121:0> 100000.times{ Marshal.load(Marshal.dump(""))} (irb):121: [BUG] Segmentation fault at 0x00000000000000 ruby 2.2.10p489 (2018-03-28 revision 63023) [aarch64-linux] -- C level backtrace information ------------------------------------------- /usr/local/appsys/normal/package/lib/libruby.so.2.2(rb_vm_bugreport+0x9c) [0xffff04c92dfc] vm_dump.c:697 /usr/local/appsys/normal/package/lib/libruby.so.2.2(rb_bug_context+0xb8) [0xffff04b37908] error.c:425 /usr/local/appsys/normal/package/lib/libruby.so.2.2(sigsegv+0x40) [0xffff04c10800] signal.c:879 linux-vdso.so.1 [0xffff04dc07c0] /usr/local/appsys/normal/package/lib/libruby.so.2.2(r_object0+0x98) [0xffff04b81378] marshal.c:1773 /usr/local/appsys/normal/package/lib/libruby.so.2.2(marshal_load+0x104) [0xffff04b82fd4] marshal.c:1981 /usr/local/appsys/normal/package/lib/libruby.so.2.2(vm_call_cfunc+0x104) [0xffff04c7eae4] vm_insnhelper.c:1380 /usr/local/appsys/normal/package/lib/libruby.so.2.2(vm_exec_core+0x494) [0xffff04c8164c] vm_insnhelper.c:475 /usr/local/appsys/normal/package/lib/libruby.so.2.2(vm_exec+0x8c) [0xffff04c86f84] vm.c:1551 /usr/local/appsys/normal/package/lib/libruby.so.2.2(invoke_block_from_c+0x4d0) [0xffff04c8ba30] vm.c:873 -- https://bugs.ruby-lang.org/

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