假人的Python多处理[关闭]

Question

我正在尝试找到一个简单的示例，清楚地显示单个任务被划分为多处理。

坦率地说，许多示例都过于复杂，从而使流程更难玩。

有人愿意分享他们的突破性样本或示例吗？

Answer 1

你的基本例子是这样的：

>>> import multiprocessing as mp
>>> from math import sqrt
>>> worker_pool = mp.Pool()
>>> jobs = [0, 1, 4, 9, 16, 25] 
>>>
>>> # calculate jobs in blocking batch parallel
>>> results = worker_pool.map(sqrt, jobs)
>>> results
[0.0, 1.0, 2.0, 3.0, 4.0, 5.0]
>>>
>>> # calculate jobs in asynchronous parallel
>>> results = worker_pool.map_async(sqrt, jobs)
>>> results.get()
[0.0, 1.0, 2.0, 3.0, 4.0, 5.0]
>>>
>>> # calculate jobs in parallel with an unordered iterator
>>> results = worker_pool.imap_unordered(sqrt, jobs)
>>> list(results)  # NOTE: results may return out of order
[0.0, 1.0, 2.0, 3.0, 4.0, 5.0]
>>>
>>> # a single blocking job on another process
>>> worker_pool.apply(sqrt, [9])
3.0
>>> # a single asynchronous job on another process
>>> y = worker_pool.apply_async(sqrt, [9])
>>> y.get()
3.0
>>> # the same interface exists for threads
>>> thread_pool = mp.dummy.Pool()
>>> thread_pool.map(sqrt, jobs)
[0.0, 1.0, 2.0, 3.0, 4.0, 5.0]
>>>
>>> # finishing up, you should shut down your pools
>>> worker_pool.close()
>>> worker_pool.join()
>>> thread_pool.close()
>>> thread_pool.join()

如果您不想批量并行，但想要更复杂的东西，示例可能会变得更复杂。