概念:多个进程存储在pool里,就形成了进程池。
作用: 由于创建和消毁进程是需要大量的资源维持的,所以我们可以把一些进程放到pool里。
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
from multiprocessing import Pool import os import time import random def worker(msg): t_start = time.time() print('%s开始执行任务,进程号为%d' % (msg, os.getpid())) time.sleep(random.random() * 2) t_stop = time.time() print(msg, '执行完毕,用时%0.2f' % (t_stop - t_start)) def main(): po = Pool(3) for i in range(0, 10): po.apply_async(worker, (i,)) print('start'.center(50, '-')) po.close() po.join() print('end'.center(50, '=')) if __name__ == '__main__': main()