robert wrote: > Thus communicated data is "serialized" - not directly used as with threads or > with custom shared memory techniques like POSH object sharing.
Correct, and that is precisely why MPI code is a lot easier to write and debug than thread code. The OP used a similar technique in his 'parallel python' project. This does not mean that MPI is inherently slower than threads however, as there are overhead associated with thread synchronization as well. With 'shared memory' between threads, a lot more fine grained synchronization ans scheduling is needed, which impair performance and often introduce obscure bugs. -- http://mail.python.org/mailman/listinfo/python-list
