We are pleased to announce the release of Ruby 2.2.0.

Ruby 2.2 includes many new features and improvements for the increasingly
diverse 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 unable
to 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 will
be helpful for running Rails applications. Recent developments mentioned on the
Rails blog
suggest that Rails 5.0 will take advantage of Incremental GC as well as
Symbol GC.

Another feature related to memory management is an additional option
for configure.in to use jemalloc
Feature #9113.
This feature is still experimental and currently disabled by default until we
gather performance data and more use cases. When we are convinced of the
benefits, this feature will be enabled by default.

Experimental support for using vfork(2) with system() and spawn() have also
been added. You can read more detail on
tanaka-san’s blog in Japanese.
This could potentially bring huge speed-up when a large process executes
external commands many times.
However vfork(2) is still not well understood and a potentially harmful
system call. We would like to experiment to find out how much benefit can be
gained 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

See NEWS in Ruby repository
for 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

Read more at the source