# -*- coding:UTF-8 -*-
from multiprocessing import Pool
import os,time,random
def worker(msg):
t_start = time.time()
print('%s开始执行,进程号为%d' % (msg,os.getpid()))
# random.random() 随机生成0-1之间的浮点数
time.sleep(random.random()*2)
t_stop = time.time()
print(msg,'执行完毕,耗时%0.2f' % (t_stop-t_start))
if __name__ == '__main__':
po = Pool(2) #定义一个进程池,最大进程数为3
for i in range(0, 10):
# Pool().apply_async(调用的目标,(传递给目标的参数元祖,))
# 每次循环将会用空闲的子进程去调用目标
po.apply_async(worker, (i,))
print('开始')
po.close() #关闭进程池,关闭后po不在接收新的请求
po.join() #等待po中所有子进程执行完毕,必须放在close语句之后
print('结束')