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MESSAGE IN A BOTTLE Konstantin Haase Aloha Ruby Conference October 8, 2012

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Ruby 1.8 is slow because it's interpreted.

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Surprise! Ruby 1.9 is interpreted, too.

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THANKS

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@konstantinhaase (I’m sorry about that) rkh on github

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WWAPD

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Ruby

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Internals

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Performance

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RubyMotion rupypy

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WHAT WE’LL LOOK INTO MRI: method dispatch and execution Rubinius: inline caches and JIT JRuby: invokedynamic

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THEY JUST LOVE BYTECODE

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MRI

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Rubinius

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JRuby (JVM 1.6)

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Source Code Parser Parse Tree Interpreter Bytecode Compiler Bytecode Interpreter JIT Machine Code CPU VM

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THE PLAN Find Method Execute Method

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Performance

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HOW TO SPEED UP? Find Method Faster Execute Method Faster

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FIND FASTER Inline Cache (aka Call/ Send Site Cache) Lookup Cache Inlining

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EXECUTE FASTER Reduce operations Just-in-time compilation Speed up search

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rb_method_entry rb_method_entry_without_cache search_method

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Module MethodTable Bucket CompiledCode

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InlineCache MachineCode CompiledCode initial_backend execute_backend cache_[cTrackedICHits] execute empty_cache ...

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SPECIALIZED METHODS cached bytecode code with breakpoints specialized for arguments JITed code

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Process invokedynamic JVM method bootstrap guard fallback

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Reducing CPU instructions Reducing jumps Not breaking late binding

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caching inlining JITing guards

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FAST LOOKUP FAST EXECUTION

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THANKS