Home Original page

Unit testing multiprocessing code on Windows

Matt Chaput matt at whoosh.ca
Thu Feb 17 18:31:59 EST 2011 
Does anyone know the "right" way to write a unit test for code that uses 
multiprocessing on Windows?

The problem is that with both "python setup.py tests" and "nosetests", 
when they get to testing any code that starts Processes they spawn 
multiple copies of the testing suite (i.e. the new processes start 
running tests as if they were started with "python setup.py 
tests"/"nosetests"). The test runner in PyDev works properly.

Maybe multiprocessing is starting new Windows processes by copying the 
command line of the current process? But if the command line is 
"nosetests", it's a one way ticket to an infinite explosion of processes.

Any thoughts?

Thanks,

Matt
More information about the Python-list mailing list