在命令行或 $RUBYOPT 環境變量中指定 --jit 參數開啓 JIT:ruby
$RUBYOPT
--jit
ruby --jit test.rb ruby --jit-verbose=1 test.rb RUBYOPT="--jit" rails server RUBYOPT="--jit-verbose=1" rails server RUBYOPT="--jit" sidekiq