python中多进程并行的示例分析-创新互联
小编给大家分享一下python中多进程并行的示例分析,希望大家阅读完这篇文章之后都有所收获,下面让我们一起去探讨吧!
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from multiprocessing import Process import sys, os import time def timetask(string): while True: print(string) def works(func, arg, worknum): proc_record = [] for i in range(worknum): p = Process(target = func, args = (i,)) p.start() proc_record.append(p) for p in proc_record: p.join() if __name__ == '__main__': arg = 5 procs = 4 works(timetask, arg, procs)
效果图【未加锁,会发现数字1没出现,进程间资源抢夺导致】:
优化之后效果:
代码:
from multiprocessing import Process import sys, os import time from threading import Lock def timetask(string): mutex.acquire() while True: print(string) if mutex.locked(): mutex.release() mutex = Lock() def works(func, arg, worknum): proc_record = [] for i in range(worknum): p = Process(target = func, args = (i,)) p.start() proc_record.append(p) for p in proc_record: p.join() if __name__ == '__main__': arg = 5 procs = 4 works(timetask, arg, procs)
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