June 9th, 2024

enable_yjit initializer はないなった

Ruby on Rails

Rails で YJIT がデフォルトで有効になる流れで

Enable YJIT by default if running Ruby 3.3+ by byroot · Pull Request #49947 · rails/rails
There was many public reports of 15-25% latency improvements for Rails apps that did enable Ruby 3.2 YJIT, and in 3.3 it's even better. Following ruby/ruby#8705, in Ruby 3.3 YJIT is paused inst…
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このPRが作られ、enable_yjit.rb 内でYJITが有効化される流れだった

if defined? RubyVM::YJIT.enable
  Rails.application.config.after_initialize do
    RubyVM::YJIT.enable
  end
end

がしかし、

Move plumbing to enable yjit to inside the framework by rafaelfranca · Pull Request #51894 · rails/rails
There is no reason to expose all those details to users and this has the benefit that now are can ensure that the YJIT is enabled after all initialization is done.
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この PR で YJITは Rails.application.config.yjit で指定することとなった。

Rails.application.configure do
  config.yjit = true
end