Dimitar Tasev added the comment:
I have looked into your advice of changing multiprocessing.heap.Arena.__init__,
I have removed the code that allocated the file and reverted to the old
behaviour.
I have done some brief runs and it seems to bring back the old behaviour which
is allocating the space in RAM, rather than with IO. I am not sure what things
this might break, and it might make the other usages of multiprocessing
unstable!
Can anyone think of anything this change might break? The Arena.__init__ code
is the one from Python 2.7:
class Arena(object):
def __init__(self, size, fd=-1):
self.size = size
self.fd = fd # still kept but is not used !
self.buffer = mmap.mmap(-1, self.size)
There does not seem to be a difference regardless of the start method setting
multiprocessing.set_start_method('fork') to be 'fork'.
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