python多进程学习笔记

时间:2021-11-15 04:19:27
# coding=utf-8
from multiprocessing import Process,Pool
import os
import time

def printf(args):
# time.sleep(1)
print "pool: %d [%s]---%s" % (args+1,os.getpid(),time.time()) # os.getpid()获取当前的进程的ID

def works(func, lista, worknum):
t_start
= time.time() # 开始计时
pool = Pool(worknum) # 定义并发进程数,worknum如果给了5,就是5个进程并发,如果要处理下面100次func函数的任务,那么并发后只需要处理20次
for i in lista: # 相当于要执行的任务量(range(100))
pool.apply_async(func,args=(i,)) # 执行func函数(即printf函数)
pool.close()
pool.join()
# 调用join函数前,先调用close函数。执行完close后,不会有新的进程加入到pool,join函数等待所以子进程结束
t_end = time.time() # 计时结束
t = t_end - t_start
print "the program time is :%s" %t

if __name__ == "__main__":
lista
= range(100)
procs
= 10
works(printf, lista, procs)