Posted by naruse on 24 Feb 2018
We are pleased to announce the release of Ruby 2.6.0-preview1.
Ruby 2.6.0-preview1 is the first preview toward Ruby 2.6.0. This preview1 is released earlier than usual because it includes an important new feature, JIT.
Ruby 2.6 introduces an initial implementation of JIT (Just-in-time) compiler.
JIT compiler aims to improve performance of any Ruby program execution. Unlike ordinary JIT compilers for other languages, Ruby’s JIT compiler does JIT compilation in a unique way, which prints C code to a disk and spawns common C compiler process to generate native code. See also: MJIT organization by Vladimir Makarov.
How to use: Just specify
--jit in command line or
$RUBYOPT environment variable. Specifying
--jit-verbose=1 allows to print basic information of ongoing JIT compilation. See
ruby --help for other options.
The main purpose of this JIT release is to provide a chance to check if it works for your platform and to find out security risks before the 2.6 release. Currently JIT compiler is supported only when Ruby is built by gcc or clang and the compiler is available on runtime. Otherwise you can’t use it for now.
As of 2.6.0-preview1, we’re just preparing infrastructure for JIT and very few optimizations are implemented. You can measure some of potential improvements in micro benchmarks with this release, but it is NOT ready for benchmarking final performance of Ruby’s JIT compiler, especially for large programs like Rails applications.
We’re going to implement method inlining in JIT compiler, which is expected to increase Ruby’s performance significantly.
Also, we’re planning to increase the supported platforms, and the next plan is to support Visual Studio.
Stay tuned for the new age of Ruby’s performance.
Random.bytes. [Feature #4938]
Binding#source_location. [Feature #14230]
This method returns the source location of binding, a 2-element array of
__LINE__. Traditionally, the same information could be retrieved by
eval("[__FILE__, __LINE__]", binding), but we are planning to change this behavior so that
binding’s source location [Bug #4352]. So, users should use this newly-introduced method instead of
:exceptionoption to let
Kernel.#systemraise error instead of returning
false. [Feature #14386]
Proc#callbecause we don’t need to care about
$SAFEany more. [Feature #14318]
lc_fizzbuzzbenchmark which uses
Proc#callso many times we can measure x1.4 improvements [Bug #10212].
blockis passed block parameter. [Feature #14330]
Ruby 2.5 improves block passing performance. [Feature #14045] Additionally, Ruby 2.6 improves the performance of passed block calling. With micro-benchmark we can observe 2.6x improvement.
Other notable changes since 2.5
$SAFEis a process global state and we can set
0again. [Feature #14250]
eoutvararguments are changed to keyword arguments. [Feature #14256]
Merged RubyGems 2.7.6
With those changes, 1115 files changed, 23023 insertions(+), 14748 deletions(-) since Ruby 2.5.0!
Today, Feburary 24th, is Ruby’s 25th birthday. Happy birthday Ruby, and enjoy programming with Ruby 2.6.0-preview1!
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