best way to serve wsgi with multiple processes

[Robin]

Hi,

I am building some computational web services using soaplib. This
creates a WSGI application.

However, since some of these services are computationally intensive,
and may be long running, I was looking for a way to use multiple
processes. I thought about using multiprocessing.Process manually in
the service, but I was a bit worried about how that might interact
with a threaded server (I was hoping the thread serving that request
could just wait until the child is finished). Also it would be good to
keep the services as simple as possible so it's easier for people to
write them.

I have at the moment the following WSGI structure:
TransLogger(URLMap(URLParser(soaplib objects)))
although presumably, due to the beauty of WSGI, this shouldn't matter.

As I've found with all web-related Python stuff, I'm overwhelmed by
the choice and number of alternatives. I've so far been using cherrypy
and ajp-wsgi for my testing, but am aware of Spawning, twisted etc.
What would be the simplest [quickest to setup and fewest details of
the server required - ideally with a simple example] and most reliable
[this will eventually be 'in production' as part of a large scientific
project] way to host this sort of WSGI with a process-per-request
style?

Thanks!

Robin