Python多处理& pathos:导入错误

时间:2016-08-05 12:13:59

标签: python multiprocessing python-import pathos

我正在使用multiprocessing&编写一些python代码。感伤。我已经编写了一个小测试程序来习惯使用多处理,它在我的本地机器上运行良好,但它拒绝在不同的集群上运行。

我收到以下错误:

Traceback (most recent call last):
  File "./multi.py", line 116, in <module>
    pool = pathos_multiprocessing.Pool(processes=pool_size,maxtasksperchild=1,)
  File "/usr/local/lib/python3.4/dist-packages/multiprocess/pool.py", line 150, in __init__
    self._setup_queues()
  File "/usr/local/lib/python3.4/dist-packages/multiprocess/pool.py", line 243, in _setup_queues
    self._inqueue = self._ctx.SimpleQueue()
  File "/usr/local/lib/python3.4/dist-packages/multiprocess/context.py", line 110, in SimpleQueue
    from .queues import SimpleQueue
  File "/usr/local/lib/python3.4/dist-packages/multiprocess/queues.py", line 22, in <module>
    import _multiprocess as _multiprocessing
ImportError: No module named '_multiprocess'

但是当我做了

pip3 list

两个悲and和多处理模块显然都存在:

multiprocess (0.70.4)
nbconvert (4.2.0)
nbformat (4.0.1)
nose (1.3.1)
notebook (4.2.0)
numpy (1.10.4)
oauthlib (0.6.1)
pathos (0.2.0)

为什么会发生这种情况的任何好主意都会受到欢迎!

小测试代码是:

#! /usr/bin/env python3

import pathos.multiprocessing as mp
import os
import random

class Pool_set:
    def pool_fun(directory_name):
        cwd=os.getcwd()
        os.mkdir(str(directory_name))
        directory=os.path.join(cwd,str(directory_name))
        os.chdir(directory)
        os.system('{}'.format('sleep '+str(directory_name)))
        cwd2=os.getcwd()
        print(cwd2)
        test_file = open('test_file.out','w')
        test_file.write(cwd2)
        print("Finished in "+directory)
        os.chdir(cwd)

if __name__ == '__main__':


    config=[]
    pool_set = Pool_set
    for i in (random.sample(range(1,100),3)):
        config.append(i)

    pool_size = mp.cpu_count()
    pool = mp.Pool(processes=pool_size,maxtasksperchild=1,)

    pool_outputs = pool.map(pool_set.pool_fun,config)
    pool.close()
    pool.join()

1 个答案:

答案 0 :(得分:0)

我是pathosmultiprocess作者。我认为有两个可能的原因你找不到_multiprocess。第一个也是最常见的原因是你没有C ++编译器。 multiprocessing需要一个C ++编译器,如果你在Windows上,你必须安装一个。见:https://wiki.python.org/moin/WindowsCompilers。第二个问题是,由于PATH / PYTHONPATH如果您遇到prefix等问题而导致安装问题,因此无法找到它,但这是极少数情况。