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Re: intermittent ValueErrors from subprocess

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  Re: intermittent ValueErrors from subprocess Pavlos Parissis <pavlos.parissis@gmail.com> - 2016-05-16 01:17 +0200

#108650 — Re: intermittent ValueErrors from subprocess

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On 16/05/2016 12:59 πμ, Chris Angelico wrote:
> On Mon, May 16, 2016 at 8:32 AM, Pavlos Parissis
> <pavlos.parissis@gmail.com> wrote:
>>> Searching the CPython sources for that exception shows one hit:
>>> selectors.py, where it converts a file object to an integer file
>>> descriptor. (You could have helped out by showing us the full
>>> traceback.)
>>
>> I did, https://gist.github.com/unixsurfer/67db620d87f667423f6f6e3a04e0bff5
> 
> Ah. I didn't click that link in your original post - didn't know it
> was the traceback. Better would have been to at least say so; best
> would have been to include it inline.
> 

I don't usually include traces as they have long lines and several
e-mail clients mess with them in a way that makes the trace unreadable.

>>> Is it possible you were running out of file descriptors,
>>> or in some other way unable to create the pipe?
>>
>> I don't think as I see right now only 8 FDs:
>>
>> sudo ls -1 /proc/22706/fd|wc
>>       8       8      16
>>
> 
> If you can recreate the problem consistently,

I can't. This is my main problem. This code has been executed ~100K and
that exception has occurred only ~5 times.

> it would be worth
> messing around with slightly lower level APIs - using subprocess.Popen
> rather than check_output, for instance - and see what you can do
> without the pipes.

What do you mean by that?

> Somewhere, something's failing, and it's not easy
> to see what.
> 
> ChrisA
> 

Thanks once again,
Pavlos

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