config.threadsafe!: JUST DO IT

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config.threadsafe! JUST DO IT Tony Arcieri RailsConf 2012 Wednesday, April 25, 12

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Most Rails apps can only do one thing at a time Wednesday, April 25, 12

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BAD Wednesday, April 25, 12

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48(5< 5(48(67 '% 5(63216( Wednesday, April 25, 12

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48(5< 5(48(67 '% 5(63216( Wednesday, April 25, 12

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DB Queries = Wasted Time Wednesday, April 25, 12

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Wednesday, April 25, 12

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Rails CAN do more than one thing at a time (since Rails 2.2) Wednesday, April 25, 12

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THREADS Wednesday, April 25, 12

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# Enable threaded mode # config.threadsafe! config/environments/production.rb Wednesday, April 25, 12

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# Enable threaded mode config.threadsafe! config/environments/production.rb Wednesday, April 25, 12

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DONE Wednesday, April 25, 12

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Curious Suspicious How Rubyists See Threads Wednesday, April 25, 12

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“I don’t want to have to deal with concurrency” Wednesday, April 25, 12

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TOO LATE Wednesday, April 25, 12

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Concurrency: You’re already doing it User.transaction do ... end Wednesday, April 25, 12

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Your DB uses threads* Your app should too *If it doesn’t, it probably sucks Wednesday, April 25, 12

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'% One VM, Multiple Requests Wednesday, April 25, 12

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Won’t the GIL get in the way? Wednesday, April 25, 12

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NO Wednesday, April 25, 12

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I/O automatically releases the GIL Wednesday, April 25, 12

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C extensions can release the GIL too Wednesday, April 25, 12

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“Are my gems thread-safe?” Wednesday, April 25, 12

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Wednesday, April 25, 12

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lib/ can be a pain Eager Loading Wednesday, April 25, 12

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class HerpDerper < ActiveRecord::Base include ThingFrobber end Wednesday, April 25, 12

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app/models/herp_derper.rb:2:in `': uninitialized constant HerpDerper::ThingFrobber (NameError) from app/models/herp_derper.rb:1:in `' Wednesday, April 25, 12

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Wednesday, April 25, 12

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Wednesday, April 25, 12

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Require your dependencies with require_dependency Wednesday, April 25, 12

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require_dependency 'thing_frobber' class HerpDerper < ActiveRecord::Base include ThingFrobber end Wednesday, April 25, 12

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Wednesday, April 25, 12

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Multicore Wednesday, April 25, 12

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Multicore Is The Future Wednesday, April 25, 12

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AMD Bulldozer 1 CPU = 16 Cores Wednesday, April 25, 12

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Why run N VMs when you could run just 1? Wednesday, April 25, 12

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•Higher Throughput •Pool Resources •Save Memory Threads are more efﬁcient Wednesday, April 25, 12

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Rubinius Ruby without a GIL! Multicore parallelism! Wednesday, April 25, 12

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My dream for Rails 4... Wednesday, April 25, 12

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# Enable threaded mode config.threadsafe! Thread Safe by Default Wednesday, April 25, 12

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Thanks! Wednesday, April 25, 12

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Twitter: @bascule Celluloid: celluloid.io Blog: unlimitednovelty.com Wednesday, April 25, 12