Davin Potts <pyt...@discontinuity.net> added the comment:

As best as I can see, there is no magic bullet to help mitigate this.

At a minimum, I am convinced we need to update the documentation to describe 
this behavior on MacOS and recommend alternatives.

I continue to give serious thought to the idea of changing the default start 
method on MacOS from fork to spawn.  This would be a breaking change though one 
could argue MacOS has already undergone a breaking change.  Is such a change 
warranted?

The alternative (which does not seem all that appealing) is that we start 
encouraging everyone to first consider the start method before attempting to 
use multiprocessing even for their first time.  Providing sensible defaults is 
to be preferred, but changing the default to reflect a non-trivial change in 
the underlying platform is still not to be taken lightly.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33725>
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