it is built on top of greenlets and libevent (soon on libev) libraries http://packages.python.org/greenlet/
and has a very good performance http://nichol.as/benchmark-of-python-web-servers code examples https://bitbucket.org/denis/gevent/src/tip/examples/#source-path can work with uwsgi http://groups.google.com/group/gevent/browse_thread/thread/ee6274dc9a60853e?pli=1
