Python多进程中使用pool
Python 多进程中使用pool，pool中指定每次运行几个进程，当其中一个进程结束完毕后，会加入新的进程
#!/usr/bin/env python
#coding: utf-8
import multiprocessing
import os,time,random
def Lee():
print "Run task Lee-%s" %(os.getpid()) #os.getpid()获取当前的进程的ID
start=time.time()
time.sleep(random.random()*10) #random.random()随机生成0-1之间的小数
end=time.time()
print 'Task Lee, runs %0.2f seconds.' %(end - start)
def Marlon():
print "Run task Marlon-%s" %(os.getpid())
start=time.time()
time.sleep(random.random()*40)
end=time.time()
print 'Task Marlon runs %0.2f seconds.' %(end - start)
def Allen():
print "Run task Allen-%s" %(os.getpid())
start=time.time()
time.sleep(random.random()*30)
end=time.time()
print 'Task Allen runs %0.2f seconds.' %(end - start)
def Frank():
print "Run task Frank-%s" %(os.getpid())
start=time.time()
time.sleep(random.random()*20)
end=time.time()
print 'Task Frank runs %0.2f seconds.' %(end - start)
if __name__=='__main__':
function_list= [Lee,Marlon,Allen,Frank]
print "parent process %s" %(os.getpid())
pool=multiprocessing.Pool(2)
for func in function_list:
pool.apply_async(func) #Pool执行函数，apply执行函数,当有一个进程执行完毕后，会添加一个新的进程到pool中
print 'Waiting for all subprocesses done...'
pool.close()
pool.join() #调用join之前，一定要先调用close() 函数，否则会出错, close()执行后不会有新的进程加入到pool,join函数等待素有子进程结束
print 'All subprocesses done.'
--------------------------------------分割线 --------------------------------------
Python 的详细介绍：请点这里
Python 的下载地址：请点这里