python 进程池Pool
1 #-*- coding:utf-8 -*- 2 from multiprocessing import Pool 3 import os,time,random 4 5 def long_time_task(name): 6 print 'Run task name %s and pid : %s..'%(name,os.getpid()) 7 start = time.time() 8 time.sleep(random.random()*3) 9 end = time.time() 10 print 'Task %s betwine %s '%(name,(end-start)) 11 # pass 12 if __name__ == '__main__': 13 print 'Parent process %s.'%os.getpid() 14 p=Pool() 15 for i in range(5): 16 print 'now I is ' and i 17 print 'Parent process %s.'%os.getpid() 18 p.apply_async(long_time_task,args=(i,)) 19 print 'Wait for all subprocesses done...' 20 print (i,) 21 p.close() 22 p.join() 23 print 'All over'
结果（类）：
Parent process 3896.
0
Parent process 3896.
1
Parent process 3896.
2
Parent process 3896.
3
Parent process 3896.
4
Parent process 3896.
Wait for all subprocesses done...
(4,)
Run task name 0 and pid : 4300..
Run task name 1 and pid : 4596..
Task 1 betwine 1.32100009918
Run task name 2 and pid : 4596..
Task 0 betwine 2.61500000954
Run task name 3 and pid : 4300..
Task 2 betwine 2.65400004387
Run task name 4 and pid : 4596..
Task 4 betwine 0.599999904633
Task 3 betwine 2.77799987793
All over
