#365 Thread-Safety pro

Jul 09, 2012 | 10 minutes | Performance, Production, Rails 4.0

The config.threadsafe! option will likely be enabled by default in Rails 4.0. Here you will learn what this option does, how it affects production, and some tips on thread safety.

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config/production.rb

config.threadsafe!

terminal

rake middleware
rake middleware RAILS_ENV=production
rails g controller foo bar
rails s -e production
repeat 4 (curl http://localhost:3000/foo/bar &)
unicorn -E production -p 3000
rails s puma -e production

foo_controller.rb

class FooController < ApplicationController
 FOO = "bar".freeze
 @@counter = 0
 @@mutex = Mutex.new
 
 def bar
 @@mutex.synchronize do
 counter = @@counter
 sleep 1
 counter += 1
 @@counter = counter
 end
 render text: "#{@@counter}\n"
 end
end

database.yml

pool: 15