Posted by naruse on 14 Sep 2023
We are pleased to announce the release of Ruby 3.3.0-preview2. Ruby 3.3 adds a new pure-Ruby JIT compiler named RJIT, uses Lrama as a parser generator, and many performance improvements especially YJIT.
- 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.
- If you are interested in developing JIT for Ruby, please check out k0kubun’s presentation on Day 3 of RubyKaigi.
Use Lrama instead of Bison
- Replace Bison with Lrama LALR parser generator Feature #19637
- If you have interest, please see The future vision of Ruby Parser
- 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.
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
- This can be used to enable YJIT only once your application is done booting
ratio_in_yjitstat produced by
--yjit-statsis now avaiable in release builds, a special stats or dev build is no longer required.
- Exit tracing option now supports sampling
- More thorough testing and multiple bug fixes
Other Notable New Features
defined?(@ivar)is optimized with Object Shapes.
Other notable changes since 3.2
IRB has received several enhancements, including but not limited to:
irb:rdbgintegration that provides an equivalent debugging experience to
- Pager support for commands like
- More accurate and helpful information provided by the
In addition, IRB has also undergone extensive refactoring and received dozens of bug fixes to facilitate easier future enhancements.
Note: Excluding feature bug fixes.
The following deprecated constants are removed.
The following deprecated methods are removed.
Stdlib compatibility issues
ext/readline is retired
- We have
relinethat is pure Ruby implementation compatible with
ext/readlineAPI. We rely on
relinein the future. If you need to use
ext/readline, you can install
ext/readlinevia rubygems.org with
gem install readline-ext.
- We no longer need to install libraries like
C API updates
Updated C APIs
The following APIs are updated.
Removed C APIs
The following deprecated APIs are removed.
Standard library updates
RubyGems and Bundler warn if users require gem that is scheduled to become the bundled gems in the future version of Ruby.
The following default gems are updated.
- RubyGems 3.5.0.dev
- bigdecimal 3.1.4
- bundler 2.5.0.dev
- csv 3.2.8
- erb 4.0.3
- fiddle 1.1.2
- fileutils 1.7.1
- irb 1.7.4
- nkf 0.1.3
- optparse 0.4.0.pre.1
- psych 5.1.0
- reline 0.3.8
- stringio 3.0.9
- strscan 3.0.7
- syntax_suggest 1.1.0
- time 0.2.2
- timeout 0.4.0
- uri 0.12.2
- yarp 0.9.0
The following bundled gems are updated.
- minitest 5.19.0
- test-unit 3.6.1
- rexml 3.2.6
- rss 0.3.0
- net-imap 0.3.7
- rbs 3.2.1
- typeprof 0.21.8
- debug 1.8.0
The following default gem is now bundled.
- racc 1.7.1
See GitHub releases like Logger or changelog for details of the default gems or bundled gems.
With those changes, 4970 files changed, 239635 insertions(+), 165275 deletions(-) since Ruby 3.2.0!
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SIZE: 26095651 SHA1: 4441cd0db23d133e6e2f7dea28f931a68dac6ca5 SHA256: c9771d24c9b1eab532c04ed076087285601693e4d1c63f131fd078c47c5c0cea SHA512: bfeed21d011f891fe22510fe7242992c98f7fd2ce863d8be5740f56a34b726134cb3f5304e8b2dcd468fbc939648f10aae482eee15c1bf6c64b705484ed9e197
What is Ruby
Ruby was first developed by Matz (Yukihiro Matsumoto) in 1993, and is now developed as Open Source. It runs on multiple platforms and is used all over the world especially for web development.