GNU bug report logs - #22533
Non-determinism in python-3 ".pyc" bytecode

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Message #79 received at 22533 <at> debbugs.gnu.org (full text, mbox):

From: Gábor Boskovits <boskovits <at> gmail.com>
To: Ricardo Wurmus <rekado <at> elephly.net>
Cc: Marius Bakke <mbakke <at> fastmail.com>, 22533 <at> debbugs.gnu.org
Subject: Re: bug#22533: Python bytecode reproducibility
Date: Tue, 6 Mar 2018 15:57:02 +0100

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2018-03-06 15:43 GMT+01:00 Ricardo Wurmus <rekado <at> elephly.net>:

>
> Ricardo Wurmus <rekado <at> elephly.net> writes:
>
> > Marius Bakke <mbakke <at> fastmail.com> writes:
> >
> >> I suppose we'll have to set PYTHONHASHSEED somewhere in
> >> python-build-system as well.  Did you check if that makes a difference
> >> for numpy?  Perhaps it's enough to set it if we add an auto-compilation
> >> step?
> >
> > Right, I’m going to test this with numpy now.  Thanks for the hint!
>
> It did help with one file, which is now built reproducibly, namely
>
>   lib/python3.6/site-packages/numpy/testing/nose_tools/__
> pycache__/utils.cpython-36.pyc
>
> This leaves five files in numpy that shouldn’t be but unfortunately are
> different.
>
>
Unfortunately backporting the upstream version is not straightforward at
all.
There are too many changes. I will have a look at those test failures
instead.


> --
> Ricardo
>
> GPG: BCA6 89B6 3655 3801 C3C6  2150 197A 5888 235F ACAC
> https://elephly.net
>
>
>

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