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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.