#!/usr/bin/env python
# coding:UTF-8


"""
@version: python3.x
@author:曹新健
@contact: 617349013@qq.com
@software: PyCharm
@file: 5.启动大量子进程.py
@time: 2018/9/18 22:28
"""

from multiprocessing import Process,Pool
import time,os,random

def run(num):
    print("子进程%d启动---%s" % (num,os.getpid()))
    start = time.time()
    time.sleep(random.choice([1,2,3]))
    end = time.time()
    #print(end)
    print("子进程%d结束---%s---耗时%.2f" % (num, os.getpid(),end-start))


if __name__ == "__main__":
    print("父进程启动")
    #创建进程池,Pool默认为CPU核心数
    pp = Pool()
    for i in range(8):
        #创建进程，放入进程池统一管理
        result = pp.apply_async(run,args=(i,))

    #进程池在调动join之前必须先调动close，调用close之后就不能再继续添加新的进程了
    pp.close()
    pp.join()

    print("父进程结束")