python多进程并行代码实例

这篇文章主要介绍了python多进程并行代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

代码：

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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