Python3 多处理池类卡在 join() 方法中

如何解决Python3 多处理池类卡在 join() 方法中

尝试运行下面的代码。但是,我无法使用 join() 方法将结果组合到一本字典中。它只是无限期地继续下去。不确定是我做错了什么,还是某些库尚未针对我的 MacBook 芯片进行优化。

import random
import time
import multiprocessing as mp
import math

start_time = time.time()
probs = {"cats":0.10,"dogs": 0.80,"bats": 0.10}

calculations = 10000
processors = 8

def f(how_many_times,times):
    for i in range(how_many_times):
        rand_num = random.random()
        total = 0
        for animal,prob in probs.items():
            total += prob
            if total > rand_num:
                times[animal] += 1
                break

if __name__ == '__main__':
    start_time = time.time()
    
    manager = mp.Manager()
    total_times = manager.dict()
    pool = mp.Pool(processors)
    calculations_per_processor = math.floor(calculations/processors)
    for i in range(processors):
        job = pool.apply_async(f,args=(calculations_per_processor,total_times))
    
    pool.close()
    pool.join()
    
    print("--- %s seconds ---" % (time.time() - start_time))

代码强行退出后给出如下报告:

---------------------------------------------------------------------------
KeyboardInterrupt                         Traceback (most recent call last)
<ipython-input-3-890e4966932e> in <module>
     10 
     11     pool.close()
---> 12     pool.join()
     13 
     14     print("--- %s seconds ---" % (time.time() - start_time))

/opt/anaconda3/lib/python3.8/multiprocessing/pool.py in join(self)
    660         elif self._state not in (CLOSE,TERMINATE):
    661             raise ValueError("In unknown state")
--> 662         self._worker_handler.join()
    663         self._task_handler.join()
    664         self._result_handler.join()

/opt/anaconda3/lib/python3.8/threading.py in join(self,timeout)
   1009 
   1010         if timeout is None:
-> 1011             self._wait_for_tstate_lock()
   1012         else:
   1013             # the behavior of a negative timeout isn't documented,but

/opt/anaconda3/lib/python3.8/threading.py in _wait_for_tstate_lock(self,block,timeout)
   1025         if lock is None:  # already determined that the C code is done
   1026             assert self._is_stopped
-> 1027         elif lock.acquire(block,timeout):
   1028             lock.release()
   1029             self._stop()

KeyboardInterrupt: 

解决方法

此问题仅出现在 Jupyter 笔记本中。在终端中运行代码时,join() 方法没有问题。不知道如何修理笔记本。我试图卸载 anaconda 并使用 pip3 重新安装笔记本。虽然没有成功

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