How to get returned data from multiple functions using multiprocessing

Question

import multiprocessing

def worker1(num):
    return num + 10

def worker2(num):
    return num + 20

if __name__ == "__main__":

    p1 = multiprocessing.Process(target=worker1, args=[5])
    p2 = multiprocessing.Process(target=worker2, args=[5])

    print(p1)
    print(p2)

    p1.start()
    p2.start()

    p1.join()
    p2.join()

I am new in multiprocessing.

Here i am Implement multiprocessing with python. It is working. But, how can i get the result whatever the two functions are returning.

When i am printing p1, and p2 i am getting below result.

<Process(Process-1, initial)>
<Process(Process-2, initial)>

The *process* isn't the value you want. What you want is the value returned by the appropriate `worker`. You'll need to set up a communication mechanism to get that value out. — Scott Hunter, May 01 '19 at 15:45

score 2 · Accepted Answer · answered May 01 '19 at 15:49

2

I believe the right way to do it would be multiprocessing.manager() or multiprocessing.Queue(). Using Queue would be a simpler approach which gives you a simple shared variable which can contain the results for each process.

answered May 01 '19 at 15:49

Akash Sundaresh

106
5

Hi Akash, I am not able to get suitable examples could you please help – soubhagya pradhan May 01 '19 at 16:20
There's already an answer for this here, https://stackoverflow.com/questions/10415028/how-can-i-recover-the-return-value-of-a-function-passed-to-multiprocessing-proce – Akash Sundaresh May 01 '19 at 16:30

How to get returned data from multiple functions using multiprocessing

1 Answers1