https://www.cnblogs.com/mylu/p/11247125.html

ProcessPoolExecutor多进程并发任务管理

from concurrent.futures import ProcessPoolExecutor, as_completed
import random
import time

def fib(n):
    if n > 30:
        raise Exception('can not > 30, now %s' % n)
    if n <= 2:
        return 1

    return fib(n - 1) + fib(n - 2)


nums = [random.randint(0, 10) for _ in range(0, 10)]
if __name__ == '__main__':

    with ProcessPoolExecutor(max_workers=4) as executor:
        futures = {}
        for n in nums:
            job = executor.submit(fib, n)
            futures[job] = n
        # as_completed()方法是一个生成器,在没有任务完成的时候,会阻塞,
        # 在有某个任务完成的时候,会yield这个任务,就能执行for循环下面的语句,然后继续阻塞住,循环到所有的任务结束。从结果也可以看出,先完成的任务会先通知主线程。
        for job in as_completed(futures):
            try:
                re = job.result()
                n = futures[job]
                print('fib(%s) result is %s.' % (n, re))
            except Exception as e:
                print(e)


原创文章,转载请注明出处:http://124.221.219.47/article/78961/