[issue17038] multiprocessing only use one core when C module are imported

[Giampaolo Rodola']

Giampaolo Rodola' added the comment:

Ended up here by accident. For whoever bumps into this same issue, psutil allows to get an set CPU affinity, so you can avoid using taskset.

>>> import psutil
>>> psutil.cpu_count()
4
>>> p = psutil.Process()
>>> p.cpu_affinity()  # get
[0, 1, 2, 3]
>>> p.cpu_affinity([0])  # set; from now on, process will run on CPU #0 only
>>> p.cpu_affinity()
[0]
>>>
>>> # reset affinity against all CPUs
>>> all_cpus = list(range(psutil.cpu_count()))
>>> p.cpu_affinity(all_cpus)
>>>

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nosy: +giampaolo.rodola

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17038>
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