python多进程并行执行和顺序执行的时间测试

#_*_coding:utf-8_*_

import time
from  multiprocessing import Pool
from threading import Thread

def func1(fn):
time.sleep(1)
return fn * fn

if __name__ == "__main__":
a = [1,2,3,4,5,6]
print "顺序执行的方式开始..."
s = time.time()
for i in a:
func1(i)
el = time.time()
print "顺序执行时间为:",int(el - s)

print "创建多个进程，并行执行开始"
pool = Pool(5) #创建拥有5个进程数量的进程池,也就是说可以同时跑5个线程
p1 = pool.map(func1,a)
pool.close() #关闭进程池，不再接受新的进程
pool.join() #主进程阻塞等待子进程的退出
e3 = time.time()
print "多进程并行时间为:", int(e3 - el)

print p1