RubyConf Mini 2022: Making .is_a? Fast by John Hawthorn

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Confreaks

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Published on March 1, 2023 4:00:28 PM ● Video Link: https://www.youtube.com/watch?v=zcKbWXzopCU

Duration: 27:16

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Until Ruby 3.2 the `is_a?` method can be a surprising performance bottleneck. It be called directly or through its various synonyms like case statements, rescue statements, protected methods, `Module#===` and more! Recently `is_a?` and its various flavours have been optimized and it's now faster and runs in constant time. Join me in the journey of identifying it as a bottleneck in production, implementing the optimization, squashing bugs, and finally turning it into assembly language in YJIT.