def Lee():
print "\nRun 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 "\nRun 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 "\nRun 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 "\nRun 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(4)
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.'
一次执行结果
parent process 7704
Waiting for all subprocesses done...
Run task Lee-6948
Run task Marlon-2896
Run task Allen-7304
Run task Frank-3052
Task Lee, runs 1.59 seconds.
Task Marlon runs 8.48 seconds.
Task Frank runs 15.68 seconds.
Task Allen runs 18.08 seconds.
All subprocesses done.
--------------------------------------分割线 --------------------------------------
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