YJIT

What is YJIT?

YJIT is a lightweight, minmalistic Ruby JIT built inside CRuby.

How to use YJIT?

• Make sure you have Ruby 3.2 installed
• Make sure you have rustc 1.58.0 or newer installed before you install Ruby Check rustc version by running

rustc --version

• Pass the --yjit command line flag to ruby or set the RUBY_YJIT_ENABLE environment variable

See also

• Proposal to merge YJIT - https://bugs.ruby-lang.org/issues/18229
• Documentation from Ruby about YJIT - https://github.com/ruby/ruby/blob/master/doc/yjit/yjit.md
• Blog post from Shopify on Ruby 3.2's YJIT - https://shopify.engineering/ruby-yjit-is-production-ready