A screamingly fast, ultra-lightweight asynchronous WSGI server for CPython, written in C using Marc Lehmann's high performance libev event loop and Ryan Dahl's http_parser.

bjoern is the fastest, smallest and most lightweight WSGI server out there featuring:

• < 1000 lines of code
• Memory footprint ~ 600KB
• Single-threaded and does not use coroutines or other crap.
• 100% WSGI compliance (except for the write callback design mistake)

• Not HTTP/1.1 capable (yet).

Arch Linux:

pacman -S libev

Ubuntu Linux:

sudo aptitude install libev-dev

Mac OS X (using homebrew):

brew install libev

Other platforms may require installing libev from source.

Make sure all the dependencies mentioned in the previous section are installed before issuing the following command:

pip install bjoern

Using bjoern is easy. You can run a WSGI application directly using the bjoern.run function:

bjoern.run(wsgi_application, host, port)

Alternatively, you can run the main event loop separately:

bjoern.listen(wsgi_application, host, port)
bjoern.run()

There are existing servers that attempt to deal with WSGI but perform poorly for the reasons highlighted in this comparison table: