#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