Python 测试多进程的时间

import time
from multiprocessing import Process
def f1():
    time.sleep(2)
    print("子进程1号")
def f2():
    time.sleep(3)
    print("子进程2号")

if __name__ == '__main__':
    s = time.time()
    p = Process(target=f1,)
    p2 = Process(target=f2,)
    p.start()
    p2.start()
    p.join()
    p2.join()
    e = time.time()
    print(e-s)
    print("主进程结束")