Python進(jìn)程Multiprocessing模塊原理解析
先看看下面的幾個(gè)方法:
star() 方法啟動(dòng)進(jìn)程, join() 方法實(shí)現(xiàn)進(jìn)程間的同步,等待所有進(jìn)程退出。 close() 用來阻止多余的進(jìn)程涌入進(jìn)程池 Pool 造成進(jìn)程阻塞。參數(shù):
target 是函數(shù)名字,需要調(diào)用的函數(shù)
args 函數(shù)需要的參數(shù),以 tuple 的形式傳入
用法:
multiprocessing.Process(group=None, target=None, name=None, args=(), kwargs={}, *, daemon=None)
寫一個(gè)的例子:
from multiprocessing import Poolimport os,timedef 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())) # 默認(rèn)為自己電腦的核數(shù) p = Pool(2) for i in range(5): p.apply_async(pr,args=(’xdxd’,)) p.close() p.join() print('----------close-----------------')
通過結(jié)果可以看出,是2個(gè)進(jìn)程同時(shí)啟動(dòng),同時(shí)啟動(dòng)的進(jìn)程數(shù)與pool中設(shè)置的數(shù)量和自己電腦的核數(shù)有關(guān)
結(jié)果:
-------------------------------the current pid: 9562The xdxd is 9563The xdxd is 9564The xdxd is closeThe xdxd is closeThe xdxd is 9563The xdxd is 9564The xdxd is closeThe xdxd is closeThe xdxd is 9563The xdxd is close----------close-----------------
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