On Windows platform these two lines cause Python code execution to run in infinite loop with every loop starting from the beginning of the script:
import multiprocessing as mp manager=mp.Manager() It runs fine on Mac. What would be a reason? It successfully imports import multiprocessing as mp. But on manager=mp.Manager() it breaks (with no errors) and jumps back to the first line of the code.
On Windows, you have to protect calls to multiprocessing with if __name__ == "__main__":. See here for details on why this is required. This should work fine:
import multiprocessing as mp if __name__ == "__main__": manager=mp.Manager() Edit:
Note that putting your multiprocessing code inside functions you call from the if block is ok, too. Like this:
import multiprocessing as mp def func(x): print("Got %s" % (x,)) def main(): p = multiprocessing.Pool() results = p.map(func, range(0,5)) if __name__ == "__main__": manager = mp.Manager() main() 
if name==main scope?
multiprocessing (like creating a Pool or Process) need to be done inside the if __name__ ... block.pool.map_async(functName, ['arg1','arg2','arg3']) inside of if __name__=="__main__" too?functName() function that is called by pool.map_async(functName, argList)..... inside of `if name__=="__main"? Isn't it a mess?