Tornado (web server)

Tornado is a scalable, non-blocking web server and web application framework written in Python. It was developed for use by FriendFeed; the company was acquired by Facebook in 2009 and Tornado was open-sourced soon after.

Performance
Tornado is noted for its high performance. Its design enables handling a large number of concurrent connections (i.e., tries to solve the "C10k problem").

Modules

 * An asynchronous MongoDB driver called Motor.
 * CouchDB drivers called corduroy and trombi.
 * Asynchronous driver for PostgreSQL wrapping psycopg called Momoko

Example
The following code shows a simple web application that displays "Hello World!" when visited: