Ractor: a proposal for new concurrent abstraction without thread-safety issues #3365
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@benoittgt I'll squash most of commit, is it okay? (your commit doesn't appear in ruby repo). |
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@ko1 No problem! ;) |
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This commit introduces Ractor mechanism to run Ruby program in parallel. See doc/ractor.md for more details about Ractor. See ticket [Feature #17100] to see the implementation details and discussions. [Feature #17100] This commit does not complete the implementation. You can find many bugs on using Ractor. Also the specification will be changed so that this feature is experimental. You will see a warning when you make the first Ractor with `Ractor.new`. I hope this feature can help programmers from thread-safety issues.
This implementation has memory corruption errors so and it causes BUG on rare occasions. This commit skips suspect tests on Github actions Compiler tests.
okeeblow
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…ax` example. For ohler55#277 I've been experimenting with `Ractor`s since upgrading to Ruby 3.0 for ohler55#275 but quickly ran into `Ractor::UnsafeError` when trying to call `Ox::sax_parse` in anything except the main `Ractor`. Per Ruby's `Ractor` C extension documentation (link below): "By default, all C extensions are recognized as `Ractor`-unsafe. If C extension becomes `Ractor`-safe, the extension should call `rb_ext_ractor_safe(true)` at the `Init_` function and all defined method marked as `Ractor`-safe. `Ractor`-unsafe C-methods only been called from main-ractor. If non-main ractor calls it, then `Ractor::UnsafeError` is raised." I don't like to open seemingly-large feature requests like this without making some attempt at it myself first, and luckily it seems like `Ox::sax_parse` Just Works™ since I marked it `Ractor`-safe, even with the `class_cache`. Confirming this safety, making any remaining changes to `Ox::Sax`, and expanding this to the non-`Sax` parts of `Ox` are all unfortunately out of my depth as a n00b C coder, so I would appreciate if you could take this over if it interests you. I am happy with just `Sax` support since I have no current need for marshalling, but I imagine other `Ox` users wouldn't be satisfied if stratified. In this commit: - Enable `rb_ext_ractor_safe` preprocessor macro via `have_func` in `extconf.rb`. - Mark `Init_Ox` and `ox_sax_parse` as `Ractor` -safe. - Add a new `Ractor`-based `Ox::Sax` example exercising both parallel and serial `Ox::Sax` handler `Ractor`s to parse data from `shared-mime-info` XML files many users likely already have on their systems. Official `Ractor` info: - "Ractor: a proposal for a new concurrent abstraction without thread-safety issues": https://bugs.ruby-lang.org/issues/17100 (ruby/ruby#3365) - Ruby's official `Ractor` documentation: https://docs.ruby-lang.org/en/master/doc/ractor_md.html - "A way to mark C extensions as thread-safe, Ractor-safe, or unsafe": https://bugs.ruby-lang.org/issues/17307 (ruby/ruby#3824) - Ruby's C Extension `Ractor` documention covering `rb_ext_ractor_safe`: https://docs.ruby-lang.org/en/master/doc/extension_rdoc.html#label-Appendix+F.+Ractor+support - A `Ractor` C Extension from the creator of `Ractor` that might serve as a useful example: https://github.com/ko1/ractor-tvar Blogs: - "Ractors: Multi-Core Parallel Processing Comes to Ruby 3": https://www.ruby3.dev/ruby-3-fundamentals/2021/01/27/ractors-multi-core-parallel-processing-in-ruby-3/ - "Ruby Ractor Experiments: Safe async communication" :https://ivoanjo.me/blog/2021/02/14/ractor-experiments-safe-async/ - "Playing with Ruby Ractors": https://billy-ruffian.co.uk/playing-with-ruby-ractors/ - "How Fast are Ractors?": https://www.fastruby.io/blog/ruby/performance/how-fast-are-ractors.html (https://github.com/noahgibbs/ractor_basic_benchmarks/tree/main/benchmarks) Before this change: ``` [okeeblow@emi#CHECKING-YOU-OUT] time ./bin/checking-you-out ~/224031-dot-jpg Received /home/okeeblow/.local/share/mime/packages/user-extension-rsrc.xml /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival/mr_mime.rb:375:in `sax_parse': ractor unsafe method called from not main ractor (Ractor::UnsafeError) from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival/mr_mime.rb:375:in `block in open' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival/mr_mime.rb:331:in `open' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival/mr_mime.rb:331:in `open' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:24:in `block (2 levels) in remember_me' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:19:in `loop' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:19:in `block in remember_me' <internal:ractor>:583:in `send': The incoming-port is already closed (Ractor::ClosedError) from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:86:in `block in extended' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:63:in `each' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:63:in `each_with_object' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:63:in `extended' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/inner_spirit.rb:216:in `extend' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/inner_spirit.rb:216:in `<top (required)>' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out.rb:10:in `require_relative' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out.rb:10:in `<top (required)>' from ./bin/checking-you-out:3:in `require_relative' from ./bin/checking-you-out:3:in `<main>' ./bin/checking-you-out ~/224031-dot-jpg 0.12s user 0.05s system 100% cpu 0.168 total ``` My new `Ox::Sax` Ractor example script's usage: ``` [okeeblow@emi#ox] ./examples/sax_ractor.rb Please provide the path to a `shared-mime-info` XML package and some media-type query arguments (e.g. 'image/jpeg') ``` ``` [okeeblow@emi#ox] ./examples/sax_ractor.rb /usr/share/mime/packages/freedesktop.org.xml Please provide some media-type query arguments (e.g. 'image/jpeg') ``` Finding all-extant types: ``` [okeeblow@emi#ox] ./examples/sax_ractor.rb /usr/share/mime/packages/freedesktop.org.xml image/jpeg font/ttf application/xhtml+xml image/x-pict Parallel Ractors ["Worker 0 gave us JPEG 影像 (image/jpeg) [.jpeg,.jpg,.jpe]", "Worker 1 gave us TrueType 字型 (font/ttf) [.ttf]", "Worker 2 gave us XHTML 網頁 (application/xhtml+xml) [.xhtml,.xht]", "Worker 3 gave us Macintosh Quickdraw/PICT 繪圖 (image/x-pict) [.pct,.pict,.pict1,.pict2]"] Serial Ractor "ONLY ONE OX gave us [#<CYO JPEG 影像 (image/jpeg) [.jpeg,.jpg,.jpe]>, #<CYO TrueType 字型 (font/ttf) [.ttf]>, #<CYO XHTML 網頁 (application/xhtml+xml) [.xhtml,.xht]>, #<CYO Macintosh Quickdraw/PICT 繪圖 (image/x-pict) [.pct,.pict,.pict1,.pict2]>]" ``` …and not finding invalid ones: ``` [okeeblow@emi#ox] ./examples/sax_ractor.rb /usr/share/mime/packages/freedesktop.org.xml lol/rofl fart/butt image/jpeg Parallel Ractors ["Worker 0 gave us nothing", "Worker 1 gave us nothing", "Worker 2 gave us JPEG 影像 (image/jpeg) [.jpeg,.jpg,.jpe]"] Serial Ractor "ONLY ONE OX gave us [nil, nil, #<CYO JPEG 影像 (image/jpeg) [.jpeg,.jpg,.jpe]>]" ``` Unit tests pass.
ohler55
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Jul 27, 2021
…ax` example. (#278) For #277 I've been experimenting with `Ractor`s since upgrading to Ruby 3.0 for #275 but quickly ran into `Ractor::UnsafeError` when trying to call `Ox::sax_parse` in anything except the main `Ractor`. Per Ruby's `Ractor` C extension documentation (link below): "By default, all C extensions are recognized as `Ractor`-unsafe. If C extension becomes `Ractor`-safe, the extension should call `rb_ext_ractor_safe(true)` at the `Init_` function and all defined method marked as `Ractor`-safe. `Ractor`-unsafe C-methods only been called from main-ractor. If non-main ractor calls it, then `Ractor::UnsafeError` is raised." I don't like to open seemingly-large feature requests like this without making some attempt at it myself first, and luckily it seems like `Ox::sax_parse` Just Works™ since I marked it `Ractor`-safe, even with the `class_cache`. Confirming this safety, making any remaining changes to `Ox::Sax`, and expanding this to the non-`Sax` parts of `Ox` are all unfortunately out of my depth as a n00b C coder, so I would appreciate if you could take this over if it interests you. I am happy with just `Sax` support since I have no current need for marshalling, but I imagine other `Ox` users wouldn't be satisfied if stratified. In this commit: - Enable `rb_ext_ractor_safe` preprocessor macro via `have_func` in `extconf.rb`. - Mark `Init_Ox` and `ox_sax_parse` as `Ractor` -safe. - Add a new `Ractor`-based `Ox::Sax` example exercising both parallel and serial `Ox::Sax` handler `Ractor`s to parse data from `shared-mime-info` XML files many users likely already have on their systems. Official `Ractor` info: - "Ractor: a proposal for a new concurrent abstraction without thread-safety issues": https://bugs.ruby-lang.org/issues/17100 (ruby/ruby#3365) - Ruby's official `Ractor` documentation: https://docs.ruby-lang.org/en/master/doc/ractor_md.html - "A way to mark C extensions as thread-safe, Ractor-safe, or unsafe": https://bugs.ruby-lang.org/issues/17307 (ruby/ruby#3824) - Ruby's C Extension `Ractor` documention covering `rb_ext_ractor_safe`: https://docs.ruby-lang.org/en/master/doc/extension_rdoc.html#label-Appendix+F.+Ractor+support - A `Ractor` C Extension from the creator of `Ractor` that might serve as a useful example: https://github.com/ko1/ractor-tvar Blogs: - "Ractors: Multi-Core Parallel Processing Comes to Ruby 3": https://www.ruby3.dev/ruby-3-fundamentals/2021/01/27/ractors-multi-core-parallel-processing-in-ruby-3/ - "Ruby Ractor Experiments: Safe async communication" :https://ivoanjo.me/blog/2021/02/14/ractor-experiments-safe-async/ - "Playing with Ruby Ractors": https://billy-ruffian.co.uk/playing-with-ruby-ractors/ - "How Fast are Ractors?": https://www.fastruby.io/blog/ruby/performance/how-fast-are-ractors.html (https://github.com/noahgibbs/ractor_basic_benchmarks/tree/main/benchmarks) Before this change: ``` [okeeblow@emi#CHECKING-YOU-OUT] time ./bin/checking-you-out ~/224031-dot-jpg Received /home/okeeblow/.local/share/mime/packages/user-extension-rsrc.xml /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival/mr_mime.rb:375:in `sax_parse': ractor unsafe method called from not main ractor (Ractor::UnsafeError) from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival/mr_mime.rb:375:in `block in open' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival/mr_mime.rb:331:in `open' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival/mr_mime.rb:331:in `open' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:24:in `block (2 levels) in remember_me' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:19:in `loop' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:19:in `block in remember_me' <internal:ractor>:583:in `send': The incoming-port is already closed (Ractor::ClosedError) from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:86:in `block in extended' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:63:in `each' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:63:in `each_with_object' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/ghost_revival.rb:63:in `extended' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/inner_spirit.rb:216:in `extend' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out/inner_spirit.rb:216:in `<top (required)>' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out.rb:10:in `require_relative' from /home/okeeblow/Works/DistorteD/CHECKING-YOU-OUT/lib/checking-you-out.rb:10:in `<top (required)>' from ./bin/checking-you-out:3:in `require_relative' from ./bin/checking-you-out:3:in `<main>' ./bin/checking-you-out ~/224031-dot-jpg 0.12s user 0.05s system 100% cpu 0.168 total ``` My new `Ox::Sax` Ractor example script's usage: ``` [okeeblow@emi#ox] ./examples/sax_ractor.rb Please provide the path to a `shared-mime-info` XML package and some media-type query arguments (e.g. 'image/jpeg') ``` ``` [okeeblow@emi#ox] ./examples/sax_ractor.rb /usr/share/mime/packages/freedesktop.org.xml Please provide some media-type query arguments (e.g. 'image/jpeg') ``` Finding all-extant types: ``` [okeeblow@emi#ox] ./examples/sax_ractor.rb /usr/share/mime/packages/freedesktop.org.xml image/jpeg font/ttf application/xhtml+xml image/x-pict Parallel Ractors ["Worker 0 gave us JPEG 影像 (image/jpeg) [.jpeg,.jpg,.jpe]", "Worker 1 gave us TrueType 字型 (font/ttf) [.ttf]", "Worker 2 gave us XHTML 網頁 (application/xhtml+xml) [.xhtml,.xht]", "Worker 3 gave us Macintosh Quickdraw/PICT 繪圖 (image/x-pict) [.pct,.pict,.pict1,.pict2]"] Serial Ractor "ONLY ONE OX gave us [#<CYO JPEG 影像 (image/jpeg) [.jpeg,.jpg,.jpe]>, #<CYO TrueType 字型 (font/ttf) [.ttf]>, #<CYO XHTML 網頁 (application/xhtml+xml) [.xhtml,.xht]>, #<CYO Macintosh Quickdraw/PICT 繪圖 (image/x-pict) [.pct,.pict,.pict1,.pict2]>]" ``` …and not finding invalid ones: ``` [okeeblow@emi#ox] ./examples/sax_ractor.rb /usr/share/mime/packages/freedesktop.org.xml lol/rofl fart/butt image/jpeg Parallel Ractors ["Worker 0 gave us nothing", "Worker 1 gave us nothing", "Worker 2 gave us JPEG 影像 (image/jpeg) [.jpeg,.jpg,.jpe]"] Serial Ractor "ONLY ONE OX gave us [nil, nil, #<CYO JPEG 影像 (image/jpeg) [.jpeg,.jpg,.jpe]>]" ``` Unit tests pass.
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Quoted from https://bugs.ruby-lang.org/issues/17100
This ticket proposes a new concurrent abstraction named "Ractor", Ruby's
Actor-like feature (not an exact Actor-model).
Ractor achieves the following goals:
I'm working on this proposal in a few years, and the project name was
"Guild". I renamed it from Guild to Ractor because of Matz's preference.
Resources:
Current implementation is not complete (many bugs are remaining) but it passes current CI.
I propose to merge it soon and try the APIs, continue to develop the implementation on a master branch.