I'm probably missing something, but what's the point of using something like Tornado to handle loads of concurrent connections when your database can only handle a small number anyway? All those epolls will slow the app down, waiting on a connection from the db pool.<p>Check out Concurrence instead: <a href="http://opensource.hyves.org/" rel="nofollow">http://opensource.hyves.org/</a>
At least that's got an async MySQL driver