We are pleased to announce the release of Ruby 2.2.0-preview2.
Ruby 2.2.0-preview2 is the second preview of Ruby 2.2.0.Many new features and improvements are included for the increasinglydiverse and expanding demands for Ruby.
For example, Symbol GC makes Symbols garbage collectable.This reduces memory usage of Symbols; because GC couldn’t collect Symbols beforeRuby 2.2. Since Rails 5.0 will require Symbol GC, it will support only Ruby 2.2or later. (See Rails’ blog post for details.)
Also, new Incremental GC decreases pause time of garbage collection, which is also helpful for running Rails applications.
Another feature related to memory management is adding an option for configure.in to use jemallocFeature #9113.This is an experimental feature, and is disabled by default.We need to gather use cases and performance data.When we get convinced of the benefits, the feature will be enabled by default.
One more topic is using vfork(2) in system() and spawn() (Japanese).It is expected that it brings a huge speed-up when a large process executes external commands many times.But vfork(2) is a risky system call.We want to know how much benefit it brings through gathering use cases and performance data.
Try and enjoy programming with Ruby 2.2.0-preview2, and report us your knowledge!
Notable Changes since 2.1 Incremental GC (YARV Maniacs No.12) Symbol GC (presentation at RubyKaigi 2014) configure –with-jemalloc Feature #9113 core libraries: Support Unicode 7.0 #9092 New methods: Enumerable#slice_after #9071, Enumerable#slice_when #9826 Float#next_float, Float#prev_float #9834 File.birthtime, File#birthtime #9647 String#unicode_normalize #10084 bundled libraries: Update Psych 2.0.6 Update Rake 10.4.0 Update RDoc 4.2.0.alpha (21b241a) Update RubyGems 2.4.4+ (2f6e42e) rubygems 2.4.4+ (2f6e42e) Update test-unit 3.0.7 (removed from repository but bundledin tarball) Update minitest 5.4.3 (removed from repository but bundled in tarball) Deprecate mathn C API Remove deprecated APIs
See NEWS in Ruby repository (WIP) for details.
With those changes, 1239 files changed, 98343 insertions(+), 61858 deletions(-).
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See also the release schedule and other information:
ReleaseEngineering22
Posted by naruse on 28 Nov 2014
