Python rpy2 and matplotlib conflict when using multiprocessing

Question

I am trying to calculate and generate plots using multiprocessing. On Linux the code below runs correctly, however on the Mac (ML) it doesn\'t, giving the error below:

Answer 1

Try to upgrade matplotlib to 3.0.3:

pip3 install matplotlib --upgrade

Then everything goes fine.

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No need to read below anymore.

Yesterday, my multiprocess plot works on my MacBook Air. But not working on my MacBook Pro tomorrow morning with the same code, displaying many:

The process has forked and you cannot use this CoreFoundation functionality safely. You MUST exec().
Break on __THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__() to debug.
The process has forked and you cannot use this CoreFoundation functionality safely. You MUST exec().

They are all using 4th gen i intel CPU (i5-4xxx with air and i7-4xxx with pro). So if there are no difference on hardware, it must be on software.

So I just tried update matplot to 3.0.3 on MacBook Pro( was 3.0.1), every thing goes fine.

Also, no need to do pool.apply_async anymore.