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I am trying to check the number of cores my script is using with 'os.sched_getaffinity' method as suggested in Why does multiprocessing use only a single core after I import numpy?. But when I run

import os
os.sched_getaffinity(0)

I get

AttributeError                            
Traceback (most recent call last) <ipython-input-1-895d9c252fd1> in <module>()
1 import os
----> 2 os.sched_getaffinity(0)
AttributeError: module 'os' has no attribute 'sched_getaffinity'

What is going wrong here? Other standard methods from the 'os' module seems to work. I am running Anaconda 4.3.0 with Python 3.6.0. I tried on both Mac and Linux. Any alternative ways to check and change the task affinity?

Community
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Aki
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1 Answers1

24

The docs say "They are only available on some Unix platforms." I guess your platform isn't one of the supported ones for these set of functions. You can check what's provided by typing

>>> import os
>>> print(dir(os))

The function does exist on my Debian Linux box, but it is absent on Windows and OSX as well. I don't know why it's not there on your Linux box. Perhaps your Linux is too old?

Also a simple google for "python process affinity" gives several alternatives

Irmen de Jong
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  • You are totally right, it seems like the method is absent in my Linux box. I did not know the 'dir(os)' command. Thank you! – Aki Mar 01 '17 at 22:56