Function execution in parallel/concurrent

Question

I have 3 functions f1, f2, f3. I want to execute f1 and f2 in parallel and, once they are both completed, run f3. How could I achieve this?

from module1 import function1 as f1
from module2 import function2 as f2
from module3 import function3 as f3


if __name__ == '__main__':
    f1()
    f2()
    f3()

Take a look at the multiprocessing module.

chepner
– chepner

2022-03-25 20:31:45 +00:00
Commented Mar 25, 2022 at 20:31 — chepner
– chepner, Commented Mar 25, 2022 at 20:31

t9dupuy · Accepted Answer · 2022-03-25 20:54:15Z

1

You can use the multiprocessing module:

from multiprocessing import Process

from module1 import function1 as f1
from module2 import function2 as f2
from module3 import function3 as f3

def main():
    p1 = Process(target=f1)
    p2 = Process(target=f2)

    p1.start()
    p2.start()

    p1.join()
    p2.join()

    f3()

if __name__ == '__main__':
    main()

answered Mar 25, 2022 at 20:54

t9dupuy

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2 Comments

Javi Torre Over a year ago

Thanks for the example! What is the difference between start and join?

t9dupuy Over a year ago

Have a look at the documentation for a more precise answer but start() starts the process (on a new thread) and join() waits for the process to finish to continue the execution of the main thread

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