看到这篇文章（http://ihower.tw/rails3/deployment.html）讲常用的有三种模式： Unicorn http://unicorn.bogomips.org/ (Multi-processed模型) Thin http://code.macournoyer.com/thin/ (Evented-driven模型) Puma http://puma.io/ (Multi-threaded模型)
他们各有什么特点呢？Event Driven该怎么理解？
走同样的路，发现不同的人生
Found a very comprehensive answer: http://stackoverflow.com/questions/4113299/ruby-on-rails-server-options
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Found a very comprehensive answer: http://stackoverflow.com/questions/4113299/ruby-on-rails-server-options