Commits on Sep 7, 2022

1. TST,BUG: Us context from spawn to fork in (numpy#22204) …

   Since Python 3.8, the default start method for multiprocessing has been changed from fork to spawn on macOS
   The default start method is still fork on other Unix platforms[1], causing inconsistency on memory sharing model
   It will cause a memory-sharing problem for the test test_large_zip on macOS as the memory sharing model between spawn and fork is different
   The fix
   
   Change the start method for this test back to fork under this testcase context
   In this test case context, the bug that caused default start method changed to spawn for macOS will not be triggered
   It is context limited, so this change will not affect default start method other than test_large_zip
   All platforms have the same memory sharing model now
   After the change, test_large_zip is passed on macOS
   https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods
   
   Closes numpygh-22203

   

   vxst authored and charris committed Sep 7, 2022
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