GIL_effect.py

import multiprocessing as mp
import time

def worker(r):
    pid = mp.current_process().name

    # do some hard and time consuming work:
    global result
    res = 0

    for i in r:
        res += i

    if "Process-" in pid:
        output.put(result)
    else:
        result += res


    print("Worker {} is working with {}".format(pid, r))


if __name__ == '__main__':
    #################################################
    # Sequential Processing:
    #################################################
    t = time.time()
    result = 0

    worker(range(50_000_000))
    worker(range(50_000_000,100_000_000))

    print("Sequential Processing result: ", result)
    print("Sequential Processing took:",time.time() - t,"\n")

    #################################################
    # Multithreaded Processing:
    #################################################
    t = time.time()
    # Define an output queue
    output = mp.Queue()

    p1 = mp.Process(target=worker, args=(range(50_000_000),))
    p2 = mp.Process(target=worker, args=(range(50_000_000,100_000_000),))

    p1.start();p2.start()
    p1.join(); p2.join()

    print("Multiprocess Processing result: ", output.get())
    print("Multiprocess Processing took:",time.time() - t,"\n")