Python Multiprocessing Python进程Multiprocessing模块原理解析
Tynam.Yang 人气:1先看看下面的几个方法:
- star() 方法启动进程,
- join() 方法实现进程间的同步,等待所有进程退出。
- close() 用来阻止多余的进程涌入进程池 Pool 造成进程阻塞。
参数:
target 是函数名字,需要调用的函数
args 函数需要的参数,以 tuple 的形式传入
用法:
multiprocessing.Process(group=None, target=None, name=None, args=(), kwargs={}, *, daemon=None)
写一个的例子:
from multiprocessing import Pool import os,time def pr(str): print("The " + str + " is %s" %(os.getpid())) time.sleep(1) print("The " + str + " is close") if __name__ == "__main__": print('-------------------------------') print("the current pid: "+ str(os.getpid())) # 默认为自己电脑的核数 p = Pool(2) for i in range(5): p.apply_async(pr,args=('xdxd',)) p.close() p.join() print("----------close-----------------")
通过结果可以看出,是2个进程同时启动,同时启动的进程数与pool中设置的数量和自己电脑的核数有关
结果:
------------------------------- the current pid: 9562 The xdxd is 9563 The xdxd is 9564 The xdxd is close The xdxd is close The xdxd is 9563 The xdxd is 9564 The xdxd is close The xdxd is close The xdxd is 9563 The xdxd is close ----------close-----------------
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