Python: multiprocessing: log_to_stderr(): debugging

By using log_to_stderr(), you can enable logging, this feature us helpful while debugging a multiprocess application.

from multiprocessing import Process
import multiprocessing
import logging

def print_data():
    name = multiprocessing.current_process().name
    id = multiprocessing.current_process().pid
    print(name, id)
    print("Processing finished")

if __name__=="__main__":
    multiprocessing.log_to_stderr(logging.DEBUG)
    proc1 = Process(name='process1', target=print_data)

    proc1.start()
    proc1.join()

    print("Is proc1 alive ",proc1.is_alive())


    print("Finished")

Output

process1 31904
Processing finished
[INFO/process1] child process calling self.run()
[INFO/process1] process shutting down
Is proc1 alive  False
Finished
[DEBUG/process1] running all "atexit" finalizers with priority >= 0
[DEBUG/process1] running the remaining "atexit" finalizers
[INFO/process1] process exiting with exitcode 0
[INFO/MainProcess] process shutting down
[DEBUG/MainProcess] running all "atexit" finalizers with priority >= 0
[DEBUG/MainProcess] running the remaining "atexit" finalizers

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