如何在现有的多处理池中增加特定数量的额外工作人员? [英] how to add specific number of additional workers to an exisiting multiprocessing pool?
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问题描述
在以下情况下,我创建了具有两个工作程序的默认池并执行任务.在任务处理过程中,会定期检查task_queue,使其不会超过特定的长度限制,并防止上/下流混乱.如何动态添加更多的工作程序以减少任务队列长度?
In below situation I've created a default pool with two workers and perform tasks. During task processing the task_queue is checked regularly so it doesn't exceeds a certain length limit and prevents up/down stream clutter. How to add dynamically more workers to reduce the task queue length?
import multiprocessing as mp
... code snippet...
def main(poolsize, start_process):
pool = mp.Pool(processes=poolsize, initializer=start_process)
done = False
task_queue = []
while True:
... snippet code : do something ...
if len(task_queue) >= 10:
... code to expand pool goes here...
if done == True:
break
.. do final something ...
if __name__ == '__main__':
# freeze_support()
poolsize = 2
main(poolsize)
推荐答案
要在运行池处理作业期间添加更多工作程序,可以在while循环内添加以下函数:
To add more workers during a running pool processing job you can add below function within the while-loop:
def repopulate(pool, add_workers):
current_pool_size = len(pool._pool) # _.pool gets the current pool size.
new_pool_size = current_pool_size + add_workers
pool._processes = new_pool_size
pool._repopulate_pool()
return pool
在main()
的while循环内:
Within the while-loop from main()
:
if len(task_queue) >= 10:
new_workers = 2
repopulate(poolname, new_workers)
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