Innocently daft question coming up:

As I understand, you can run web.py apps behind lighttpd, and the web server handles the processes. E.g. in lighttpd.cfg you can set {"max-procs" => 4} and I would see 4 instances of my web.py script running. But how is this done for a web-server done 100% in python? Python uses a GIL that only allows one thread to interpret bytecode at a time, so despite the amazing performance of Twisted and Tornado, wouldn't we see this seriously degrade when the server had to anything more than 'hello world'? My worry is having a Twisted/Tornado app and only using 1/4th of my availble processing power: am I wrong to do so?