That applies to threading. Twisted and Tornado are epoll/kqueue/etc-based and do not use threads. Here's a good article on the differences between strategies:

That applies to threading. Twisted and Tornado are epoll/kqueue/etc-based and do not use threads. Here's a good article on the differences between strategies: http://www.kegel.com/c10k.html http://www.kegel.com/c10k.html