[issue18999] Robustness issues in multiprocessing.{get, set}_start_method

[Olivier Grisel]

Olivier Grisel added the comment:

Related question: is there any good reason that would prevent to pass a custom `start_method` kwarg to the `Pool` constructor to make it use an alternative `Popen` instance (that is an instance different from the  `multiprocessing._Popen` singleton)?

This would allow libraries such as joblib to keep minimal side effect by try to impact the default multiprocessing runtime as low as possible.

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nosy: +Olivier.Grisel

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<http://bugs.python.org/issue18999>
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