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Ruby Conference 2018

This presentation, by Takashi Kokubun, is licensed under a Creative Commons Attribution ShareAlike 3.0
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Have you tried the JIT compiler included in Ruby 2.6 preview releases? It's easy, just include "--jit" option to a ruby command or set RUBYOPT="--jit" environment variable. You've just learned how to enable it. But wait, are you sure you can use it? What the hell is going on behind it, why is there a GCC process under your Ruby process, and why can JIT even make your Ruby program even slower? In this talk, you'll be prepared to try the brand-new Ruby's secret power on production from the next Christmas.

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