multiprocessing 多进程

multiprocessing多进程代码演示

主要是和多线程在CPU密集型操作时的所耗时间对比

import multiprocessing
import datetime

def calc(i):
    sum = 0
    for _ in range(1000):
        sum += 1
    print(i, sum)

if __name__ == '__main__':
    start = datetime.datetime.now()

    ps = []
    for i in range(5):
        p = multiprocessing.Process(target=calc, args=(i, ), name='calc-{}'.format(i))
        ps.append(p)
        p.start()
    for p in ps:
        p.join()

    delta = (datetime.datetime.now() - start).total_seconds()
    print(delta)