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Revision as of 10:12, 1 November 2023 by Vondruch (talk | contribs) (→‎Scope: Releng ticket)


Ruby 3.3

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This is a proposed Change for Fedora Linux.
This document represents a proposed Change. As part of the Changes process, proposals are publicly announced in order to receive community feedback. This proposal will only be implemented if approved by the Fedora Engineering Steering Committee.

Summary

Ruby 3.3 is the latest stable version of Ruby. Many new features and improvements are included for the increasingly diverse and expanding demands for Ruby. With this major update from Ruby 3.2 in Fedora 39 to Ruby 3.3 in Fedora 40, Fedora becomes the superior Ruby development platform.

Owner


Current status

  • Targeted release: Fedora Linux 40
  • Last updated: 2023-11-01
  • [<will be assigned by the Wrangler> devel thread]
  • FESCo issue: <will be assigned by the Wrangler>
  • Tracker bug: <will be assigned by the Wrangler>
  • Release notes tracker: <will be assigned by the Wrangler>

Detailed Description

Ruby 3.3 is upstream's new major release of Ruby. Ruby 3.3 adds a new pure-Ruby JIT compiler named RJIT, uses Lrama as a parser generator, and many performance improvements especially YJIT.

RJIT

  • Introduced a pure-Ruby JIT compiler RJIT and replaced MJIT.
    • RJIT supports only x86_64 architecture on Unix platforms.
    • Unlike MJIT, it doesn’t require a C compiler at runtime.
  • RJIT exists only for experimental purposes.
    • You should keep using YJIT in production.

Use Lrama instead of Bison

  • Replace Bison with Lrama LALR parser generator

YJIT

  • Major performance improvements over 3.2
    • Support for splat and rest arguments has been improved.
    • Registers are allocated for stack operations of the virtual machine.
    • More calls with optional arguments are compiled.
    • Exception handlers are also compiled.
    • Instance variables no longer exit to the interpreter with megamorphic Object Shapes.
    • Unsupported call types no longer exit to the interpreter.
    • Integer#!=, String#!=, Kernel#block_given?, Kernel#is_a?, Kernel#instance_of?, Module#=== are specially optimized.
    • Now more than 3x faster than the interpreter on optcarrot!
  • Metadata for compiled code uses a lot less memory.
  • Generate more compact code on ARM64
  • Option to start YJIT in paused mode and then later enable it manually
    • --yjit-pause and RubyVM::YJIT.resume
    • This can be used to enable YJIT only once your application is done booting
  • ratio_in_yjit stat produced by --yjit-stats is now available in release builds, a special stats or dev build is no longer required.
  • Exit tracing option now supports sampling
    • --trace-exits-sample-rate=N
  • More thorough testing and multiple bug fixes

Other notable changes since 3.2

  • Performance improvements
    • defined?(@ivar) is optimized with Object Shapes.
  • IRB has received several enhancements, including but not limited to:
    • Advanced irb:rdbg integration that provides an equivalent debugging experience to pry-byebug.
    • Pager support for commands like ls and show_cmds.
    • More accurate and helpful information provided by the ls and show_source commands.
  • ext/readline is retired
    • Replaced by reline that is pure Ruby implementation compatible with ext/readline API.
  • RubyGems and Bundler warn if users require gem that is scheduled to become the bundled gems in the future version of Ruby.

Feedback

Benefit to Fedora

With a latest release, Ruby language is supporting the newest language features, which enables even faster and easier development of Ruby applications.

Scope

  • Other developers:
    • Rebuild of packages with binary extensions (i.e. packages which depends on libruby) will be handled automatically, but some packages might need fixes/updates to support Ruby 3.3 properly.
  • Release engineering: #11753
    • The packages are going to be rebuild in side-tag, but that does not need releng involvement nowadays.
  • Policies and guidelines: N/A (not needed for this Change)
  • Trademark approval: N/A (not needed for this Change)
  • Alignment with Community Initiatives:

Upgrade/compatibility impact

  • User specific Ruby binary extensions need to be rebuild.
  • Ruby packages/application dependencies might need to be adjusted if newly bundled gems are used.

How To Test

  • No special hardware is needed.
  • To test, install Ruby 3.3. The test builds are published in PR or on Ruby-SIG ML
  • Try to locally rebuild your packages using Ruby 3.3.
  • Use the packages with your applications previously written in Ruby.
  • If something doesn't work as it should, let us know.

User Experience

The Ruby programs/scripts should behave as they were used to.

Dependencies

$ dnf repoquery --disablerepo=* --enablerepo=rawhide --enablerepo=rawhide-source --arch=src --whatrequires 'ruby-devel' | sort | uniq | wc -l
134

Contingency Plan

  • Contingency mechanism: We would like to get a special buildroot tag to be able to rebuild necessary the packages with Ruby 3.3. If anything goes wrong, the tag could be easily dropped and previous version of Ruby 3.2 and its dependencies stays intact. The tag would be merged into F40 after everything is rebuild.
  • Contingency deadline: Mass Rebuild
  • Blocks release? No


Documentation

Release Notes

  • The Ruby 3.3 bumps soname, therefore Ruby packages, which use binary extensions, should be rebuilt. Nevertheless, since upstream paid great attention to source compatibility, no changes to your code are needed.

https://github.com/ruby/ruby/blob/master/NEWS.md

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