I'm just learning python. After changed it to a non-OOP program, it works. Thank you all for suggestions :)
On Mar 8, 1:38 pm, Benjamin Kaplan <benjamin.kap...@case.edu> wrote: > Is there any particular reason you're using processes and not threads? > Functions that wait for stuff to happen in C land, such as I/O calls, > release the GIL so threads can be run in parallel. It's only stuff > that happens in Python land (i.e. manipulating Python objects) that > can't be run concurrently. -- http://mail.python.org/mailman/listinfo/python-list