Python multithreading on cluster system? Embedding python in PVM?

[abhinav]

Hi guys.I have read that one cannot perform true multithreading in
python due to global interpreter lock mechanism.Suppose i have to
implement a crawler on a say cluster system like clusterknoppix so that
i can use parallel virtual machine (PVM)for programming in
multiprocessor environment or say open MPI.Can i integrate python with
PVM or MPI.Can i embed python into C for programming in multiprocessor
environment.Is there any way of embedding python in PVM or MPI so that
i can implement a true cluster based search engine?
Any help would be very kind.Thanks.