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layout title author translator date lang
news_post
Ruby 3.1.0 Preview 1 Released
naruse
2021-11-09 00:00:00 +0000
en

{% assign release = site.data.releases | where: "version", "3.1.0-preview1" | first %}

We are pleased to announce the release of Ruby {{ release.version }}.

YJIT: New experimental in-process JIT compiler

Ruby 3.1 merges YJIT, a new in-process JIT compiler developed by Shopify.

Since Ruby 2.6 introduced MJIT in 2018, its performance greatly improved, and finally we achieved Ruby3x3 last year. But even though Optcarrot has shown impressive speedups, the JIT hasn't benefited real world business applications.

Recently Shopify contributed many Ruby improvements to speed up their Rails application. YJIT is an important contribution, and aims to improve the performance of Rails applications.

Though MJIT is a method-based JIT compiler and uses an external C compiler, YJIT uses Basic Block Versioning and includes JIT compiler inside it. With Lazy Basic Block Versioning (LBBV) it first compiles the beginning of a method, and incrementally compiles the rest when the type of arguments and variables are dynamically determined. See YJIT: a basic block versioning JIT compiler for CRuby for a detailed introduction.

With this technology, YJIT achieves both fast warmup time and performance improvements on most real-world software, up to 22% on railsbench, 39% on liquid-render.

YJIT is still an experimental feature, and as such, it is disabled by default. If you want to use this, specify the --yjit command-line option to enable YJIT. It is also limited to macOS & Linux on x86-64 platforms for now.

debug gem: A new debugger

A new debugger debug.gem is bundled. debug.gem is fast debugger implementation and it provides many features like remote debugging, colorful REPL, IDE (VSCode) integration and more. It replaces lib/debug.rb standard library.

error_highlight: Fine-grained error location in backtrace

A built-in gem, error_highlight, has been introduced. It includes fine-grained error location in backtrace:

$ ruby test.rb
test.rb:1:in `<main>': undefined method `time' for 1:Integer (NoMethodError)

1.time {}
 ^^^^^
Did you mean?  times

This gem is enabled by default. You can disable it by using a command-line option --disable-error_highlight. See the repository in detail.

Irb improvement

To be described in next preview.

Other Notable New Features

Language

  • Values in Hash literals and keyword arguments can be omitted. [Feature #14579]

    • {x:, y:} is a syntax sugar of {x: x, y: y}.
    • foo(x:, y:) is a syntax sugar of foo(x: x, y: y).

  • Pin operator in pattern matching now takes an expression. [Feature #17411]

Prime.each_cons(2).lazy.find_all{_1 in [n, ^(n + 2)]}.take(3).to_a
#=> [[3, 5], [5, 7], [11, 13]]

RBS

RBS is a language to describe the structure of Ruby programs. See the repository for detail.

Updates since Ruby 3.0.0:

  • rbs collection has been introduced to manage gems' RBSs. doc
  • Many signatures for built-in and standard libraries have been added/updated.
  • It includes many bug fixes and performance improvements too.

See the CHANGELOG.md for more information.

TypeProf

TypeProf is a static type analyzer for Ruby. It generates a prototype of RBS from non-type-annotated Ruby code. See the document for detail.

Updates since Ruby 3.0.0:

Performance improvements

  • MJIT
    • For workloads like Rails, the default --jit-max-cache is changed from 100 to 10000. The JIT compiler no longer skips compilation of methods longer than 1000 instructions.
    • To support Zeitwerk of Rails, JIT-ed code is no longer cancelled when a TracePoint for class events is enabled.

Other notable changes since 3.0

  • One-line pattern matching, e.g., ary => [x, y, z], is no longer experimental.
  • Multiple assignment evaluation order has been changed slightly. [Bug #4443]
    • foo[0], bar[0] = baz, qux was evaluated in order baz, qux, foo, and then bar in Ruby 3.0. In Ruby 3.1, it is evaluated in order foo, bar, baz, and then qux.
  • Variable Width Allocation: Strings (experimental) [Bug #18239]

Standard libraries updates

  • Some standard libraries are updated.
    • RubyGems
    • Bundler
    • RDoc 6.4.0
    • ReLine
    • JSON 2.6.0
    • Psych 4.0.2
    • FileUtils 1.6.0
    • Fiddle
    • StringIO 3.0.1
    • IO::Console 0.5.9
    • IO::Wait 0.2.0
    • CSV
    • Etc 1.3.0
    • Date 3.2.0
    • Zlib 2.1.1
    • StringScanner
    • IpAddr
    • Logger 1.4.4
    • OStruct 0.5.0
    • Irb
    • Racc 1.6.0
    • Delegate 0.2.0
    • Benchmark 0.2.0
    • CGI 0.3.0
    • Readline(C-ext) 0.1.3
    • Timeout 0.2.0
    • YAML 0.2.0
    • URI 0.11.0
    • OpenSSL
    • DidYouMean
    • Weakref 0.1.1
    • Tempfile 0.1.2
    • TmpDir 0.1.2
    • English 0.7.1
    • Net::Protocol 0.1.2
    • Net::Http 0.2.0
    • BigDecimal
    • OptionParser 0.2.0
    • Set
    • Find 0.1.1
    • Rinda 0.1.1
    • Erb
    • NKF 0.1.1
    • Base64 0.1.1
    • OpenUri 0.2.0
    • SecureRandom 0.1.1
    • Resolv 0.2.1
    • Resolv::Replace 0.1.0
    • Time 0.2.0
    • PP 0.2.1
    • Prettyprint 0.1.1
    • Drb 2.1.0
    • Pathname 0.2.0
    • Digest 3.1.0.pre2
    • Un 0.2.0
  • The following bundled gems are updated.
    • minitest 5.14.4
    • power_assert 2.0.1
    • rake 13.0.6
    • test-unit 3.5.0
    • rbs 1.6.2
    • typeprof 0.20.0
  • The following default gems are now bundled gems.
    • net-ftp
    • net-imap
    • net-pop
    • net-smtp
    • matrix
    • prime

See [NEWS](https://github.com/ruby/ruby/blob/{{ release.tag }}/NEWS.md) or [commit logs](https://github.com/ruby/ruby/compare/v3_0_0...{{ release.tag }}) for more details.

With those changes, [{{ release.stats.files_changed }} files changed, {{ release.stats.insertions }} insertions(+), {{ release.stats.deletions }} deletions(-)](https://github.com/ruby/ruby/compare/v3_0_0...{{ release.tag }}#file_bucket) since Ruby 3.0.0!

Download

  • <{{ release.url.gz }}>

    SIZE: {{ release.size.gz }}
SHA1: {{ release.sha1.gz }}
SHA256: {{ release.sha256.gz }}
SHA512: {{ release.sha512.gz }}

  • <{{ release.url.xz }}>

    SIZE: {{ release.size.xz }}
SHA1: {{ release.sha1.xz }}
SHA256: {{ release.sha256.xz }}
SHA512: {{ release.sha512.xz }}

  • <{{ release.url.zip }}>

    SIZE: {{ release.size.zip }}
SHA1: {{ release.sha1.zip }}
SHA256: {{ release.sha256.zip }}
SHA512: {{ release.sha512.zip }}

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.