多处理，如何在不创建僵尸的情况下并行运行进程? [英] Multiprocessing, how to run processes in parallel without creating zombies?

问题描述

我想并行运行这些进程，因此我在__main__部分中注释了p.join. 没有.join或更好的结果会导致什么后果?我应该对并行多处理使用其他方法吗?

I'd like to run the processes in parallel, so I commented out a p.join from the __main__ section. What are the consequences of not have a .join, or better yet, should I be using a different approach for parallel multiprocessing?

import multiprocessing

def worker(num):
    x = 0
    for i in range(10000):
        x+=1
    print x, num

if __name__ == '__main__':

    for i in range(4):
        p = multiprocessing.Process(target=worker, args=(i,))
        p.start()
        # p.join()

推荐答案

启动进程后加入进程.

if __name__ == '__main__':
    procs = []
    for i in range(4):
        p = multiprocessing.Process(target=worker, args=(i,))
        p.start()
        procs.append(p)
    for p in procs:
        p.join()

---

如果您运行多个相似的任务，则可以使用多重处理.泳池.

if __name__ == '__main__':
    pool = multiprocessing.Pool()
    pool.map(worker, range(4))
    pool.close()
    pool.join()

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