We are pleased to announce the release of Ruby 2.2.0.
Ruby 2.2 includes many new features and improvements for the increasinglydiverse and expanding demands for Ruby.
For example, Ruby’s Garbage Collector is now able to collect Symbol type objects.This reduces memory usage of Symbols; because GC was previously unableto collect them before 2.2.Since Rails 5.0 will require Symbol GC, it will support only Ruby 2.2 or later.(See Rails 4.2 release post for details.)
Also, a reduced pause time thanks to the new Incremental Garbage Collector willbe helpful for running Rails applications. Recent developments mentioned on theRails blogsuggest that Rails 5.0 will take advantage of Incremental GC as well asSymbol GC.
Another feature related to memory management is an additional optionfor configure.in to use jemallocFeature #9113.This feature is still experimental and currently disabled by default until wegather performance data and more use cases. When we are convinced of thebenefits, this feature will be enabled by default.
Experimental support for using vfork(2) with system() and spawn() have alsobeen added. You can read more detail ontanaka-san’s blog in Japanese.This could potentially bring huge speed-up when a large process executesexternal commands many times.However vfork(2) is still not well understood and a potentially harmfulsystem call. We would like to experiment to find out how much benefit can begained by gathering performance data and use cases.
Try and enjoy programming with Ruby 2.2.0, and report us your findings!
Notable Changes since 2.1 Incremental GC(presentation at RubyConf 2014: “Incremental GC for Ruby interpreter”) Symbol GC(presentation at RubyKaigi 2014) configure –with-jemallocFeature #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 2.0.8 Update Rake 10.4.2 Update RDoc 4.2.0 Update RubyGems 2.4.5 Update test-unit 3.0.8 (removed from repository but bundled in tarball) Update minitest 5.4.3 (removed from repository but bundled in tarball) Deprecate mathn C API Remove deprecated APIs
See NEWS in Ruby repositoryfor details.
With those changes, 1557 files changed, 125039 insertions(+), 74376 deletions(-)from v2.1.0!
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Posted by naruse on 25 Dec 2014
