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I have been told that pickling class methods for multiprocessing are not possible with Processes. For some reason though, this code works. I have tried to complete this same task in other applications and my results have been inconsistent. What can I do for this feature to consistently work?

from multiprocessing import Process

class test():
  def run(self):
    print("HI")

  def p(self):
    p = Process(target=self.run)
    p.start()


a = test()
a.p()

I have tried utilizing this functionality with python3 and python and it has worked and not worked for both versions. How do I ensure this works?

Gabe Koleszar
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    What do you mesn with 'worked and not worked'? What did you see? This code would fail on Windows. – azelcer Jan 31 '22 at 04:04
  • I tried both python3 and python and it worked and didn't work for both. Meaning using either version did not make a difference. Why would it not work on windows? Could you elaborate? – Gabe Koleszar Jan 31 '22 at 13:02
  • I still don' t get what "it worked and didn't work" mean. It worked once and stopped worked the next time? How did it fail? Did it print anything? See [this answer](https://stackoverflow.com/a/70580915/17457042) and don't forget to call ` join` – azelcer Jan 31 '22 at 21:01

1 Answers1

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When starting a new process, Windows and Mac Spawn the process which requires objects to be pickled. On Linux however, the process is Forked which inherits memory from the parent process. If a class contains non-pickle-able objects and you want to run a class method on a separate process, you must use Linux.

Gabe Koleszar
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