[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

[Steve Newcomb]

Steve Newcomb added the comment:

On 08/30/2016 12:46 PM, Raymond Hettinger wrote:
> Raymond Hettinger added the comment:
>
> It would be helpful if you could run "hg bisect" with your set-up to isolate the change that causes the problem.
I don't think I understand you.  There's no difference in the Python 
code we're using in both cases.  The only differences, AFAIK, are in the 
Python interpreter and in the Linux distribution.  I'm not qualified to 
analyze the differences in the latter items.
>    Alternatively, make a small set of regular expressions that demonstrate the performance regression.
It will be hard to do that, because the code is so complex, and because 
debugging in the multiprocessing context is so hairy. Still, it's the 
only approach I can think of, too.  Sigh.  I'm thinking about it.

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<http://bugs.python.org/issue27898>
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