title: Caveats of select/poll vs. epoll reactors in Twisted
body: <p>Everything I've read and experienced ( Tornado based apps ) leads me to believe that ePoll is a natural replacement for Select and Poll based networking, especially with Twisted.  Which makes me paranoid, its pretty rare for a better technique or methodology not to come with a price.</p>
  
  <p>Reading a couple dozen comparisons between epoll and alternatives shows that epoll is clearly the champion for speed and scalability, specifically that it scales in a linear fashion which is fantastic.  That said, what about processor and memory utilization, is epoll still the champ?</p>