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Edge-triggered epoll concurrency model with blocking accept() in a (hopefully) native thread. This is just like Epoll, but recommended for Ruby 1.9 users as it can avoid accept()-scalability issues on multicore machines with many worker processes.
Do not use this if you have slow external dependencies.
raindrops 0.6.0 or later
sleepy_penguin 3.0.1 or later
sendfile 1.1.0 or later