multiproc_pool_with_wait.py

import multiprocessing

def serial_func(arg1):
    return arg1*2

if __name__ == '__main__':
    start_time=time.time()
    res_list=[]
    with multiprocessing.Pool(processes=multiprocessing.cpu_count()) as pool:   # start worker processes
        res_list = pool.map(serial_func,[3,4,5]) # see https://docs.python.org/3/library/multiprocessing.html

    print('main elapsed:',time.time()-start_time,'seconds')