Ruby Lands "YJIT" As A Speedy, In-Process JIT Compiler
YJIT is a JIT compiler for Ruby that leverages the lazy Basic Block Versioning (LBBV) architecture. YJIT has been in the works for a number of years. Most exciting for end-users and developers is that YJIT yields an average speed-up of around 23% compared to the current CRuby interpreter for realistic benchmarks.
With Ruby 3.1 the plan is to include it as a preview release to help test it and enjoy the performance gains, but it is currently disabled by default. The "--yjit" or "YJIT_RUBY_ENABLE=1" options are needed to currently enable this Ruby JIT. YJIT additionally supports just Linux and macOS platforms so far on x86-64 CPUs. Unsupported platforms will see the conventional Ruby interpreter used.
More details on Ruby's YJIT that was merged on Wednesday can be found via its merge request.