python - 为进程指定特定的CPU - python multiprocessing

Question

我使用 Redis 作为多处理设置中生产者/消费者关系的队列。

我的问题是我的生产者让我的消费者重载，然后窃取它的 CPU。

我的问题是，我可以在此设置中将整个处理器分配给特定功能/进程(即:消费者)吗？

Answer 1

我刚刚在项目中遇到了类似的问题，其中 3 个服务器/调度程序在各自的 CPU 核心上运行，产生了高度 CPU 密集型工作人员 - 同时，这些工作人员被设计为使用它们正在运行的特定核心充分发挥其潜力。

我需要确保这样的工作进程永远不会在运行服务器/调度程序的 CPU 核心上生成(或使用 - 因为一些工作人员还使用多处理)，因为这会导致后者的操作出现问题。

我使用了 Ioannis Filippidis's 中的以下代码答案并且它非常适合将任何进程限制到任何核心。我在本例中使用了多处理池，但是来自 child 的代码可以在任何 multiprocessing.Process 中工作。注意:它不适用于 macOS。

import multiprocessing as mp


def child(worker: int) -> None:
    import psutil
    import time

    p = psutil.Process()
    print(f"Child #{worker}: {p}, affinity {p.cpu_affinity()}", flush=True)
    time.sleep(1)
    p.cpu_affinity([worker])
    print(f"Child #{worker}: Set my affinity to {worker}, affinity now {p.cpu_affinity()}", flush=True)

    time.sleep(1 + 3 * worker)
    print(f"Child #{worker}: Starting CPU intensive task now for 4 seconds on {p.cpu_affinity()}...", flush=True)
    t_end = time.perf_counter() + 4
    while time.perf_counter() < t_end:
        pass
    print(f"Child #{worker}: Finished CPU intensive task on {p.cpu_affinity()}", flush=True)


def main() -> None:
    with mp.Pool() as pool:
        # noinspection PyProtectedMember
        workers: int = pool._processes
        print(f"Running pool with {workers} workers")

        for i in range(workers):
            pool.apply_async(child, (i,))

        # Wait for children to finnish
        pool.close()
        pool.join()

    pass


if __name__ == '__main__':
    main()

控制台输出:

Running pool with 16 workers
Child #0: psutil.Process(pid=16168, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #1: psutil.Process(pid=20864, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #2: psutil.Process(pid=15748, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #4: psutil.Process(pid=20600, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #3: psutil.Process(pid=17900, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #5: psutil.Process(pid=3288, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #7: psutil.Process(pid=19308, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #6: psutil.Process(pid=9768, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #8: psutil.Process(pid=1988, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #9: psutil.Process(pid=13960, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #11: psutil.Process(pid=3068, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #10: psutil.Process(pid=9636, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #12: psutil.Process(pid=18608, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #13: psutil.Process(pid=14356, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #14: psutil.Process(pid=14636, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #15: psutil.Process(pid=17372, name='python.exe', started='23:03:09'), affinity [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
Child #0: Set my affinity to 0, affinity now [0]
Child #1: Set my affinity to 1, affinity now [1]
Child #2: Set my affinity to 2, affinity now [2]
Child #4: Set my affinity to 4, affinity now [4]
Child #3: Set my affinity to 3, affinity now [3]
Child #5: Set my affinity to 5, affinity now [5]
Child #7: Set my affinity to 7, affinity now [7]
Child #6: Set my affinity to 6, affinity now [6]
Child #8: Set my affinity to 8, affinity now [8]
Child #9: Set my affinity to 9, affinity now [9]
Child #10: Set my affinity to 10, affinity now [10]
Child #11: Set my affinity to 11, affinity now [11]
Child #12: Set my affinity to 12, affinity now [12]
Child #13: Set my affinity to 13, affinity now [13]
Child #14: Set my affinity to 14, affinity now [14]
Child #15: Set my affinity to 15, affinity now [15]
Child #0: Starting CPU intensive task now for 4 seconds on [0]...
Child #1: Starting CPU intensive task now for 4 seconds on [1]...
Child #0: Finished CPU intensive task on [0]
Child #2: Starting CPU intensive task now for 4 seconds on [2]...
Child #1: Finished CPU intensive task on [1]
Child #3: Starting CPU intensive task now for 4 seconds on [3]...
Child #2: Finished CPU intensive task on [2]
Child #4: Starting CPU intensive task now for 4 seconds on [4]...
Child #3: Finished CPU intensive task on [3]
Child #5: Starting CPU intensive task now for 4 seconds on [5]...
Child #4: Finished CPU intensive task on [4]
Child #6: Starting CPU intensive task now for 4 seconds on [6]...
Child #5: Finished CPU intensive task on [5]
Child #7: Starting CPU intensive task now for 4 seconds on [7]...
Child #6: Finished CPU intensive task on [6]
Child #8: Starting CPU intensive task now for 4 seconds on [8]...
Child #7: Finished CPU intensive task on [7]
Child #9: Starting CPU intensive task now for 4 seconds on [9]...
Child #8: Finished CPU intensive task on [8]
Child #10: Starting CPU intensive task now for 4 seconds on [10]...
Child #9: Finished CPU intensive task on [9]
Child #11: Starting CPU intensive task now for 4 seconds on [11]...
Child #10: Finished CPU intensive task on [10]
Child #12: Starting CPU intensive task now for 4 seconds on [12]...
Child #11: Finished CPU intensive task on [11]
Child #13: Starting CPU intensive task now for 4 seconds on [13]...
Child #12: Finished CPU intensive task on [12]
Child #14: Starting CPU intensive task now for 4 seconds on [14]...
Child #13: Finished CPU intensive task on [13]
Child #15: Starting CPU intensive task now for 4 seconds on [15]...
Child #14: Finished CPU intensive task on [14]
Child #15: Finished CPU intensive task on [15]

Process finished with exit code 0

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