[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

Gregory P. Smith added the comment: 2.7 is end of life. if you have regular expression performance issues with something in 3, please open a new issue. -- nosy: +gregory.p.smith resolution: -> wont fix stage: -> resolved status: pending -> closed

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

Change by Serhiy Storchaka : -- status: open -> pending ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

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 ... make a small set of regular expressions that > demonstrate the performance regression. > Done. Attachments: test.py : Code that exercises

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

Steve Newcomb added the comment: On 09/01/2016 05:01 PM, Steve Newcomb wrote: > >> The outputs show that 2.7.12's re.sub() takes 1.2 times as long as >> 2.7.6's. It's a significant difference, but... >> >> ...it was not the dramatic degradation I expected to find in this >> exercise. On

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

Changes by STINNER Victor : -- nosy: +haypo type: -> performance ___ Python tracker ___

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

Steve Newcomb added the comment: Oops. The correct url is sftp://coolheads.com/files/py-re-perform-276v2712/ On 09/01/2016 04:52 PM, Steve Newcomb wrote: > On 08/30/2016 12:46 PM, Raymond Hettinger wrote: >> Raymond Hettinger added the comment: >> >> It would be helpful if you ... make a small

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

Steve Newcomb added the comment: On 08/30/2016 01:24 PM, Serhiy Storchaka wrote: > Serhiy Storchaka added the comment: > > According to your profile results all re functions are 2.5-4 times faster > under 2.7.12 than under 2.7.6. May be I misinterpret it? I can't explain the profiler's report.

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

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

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

Serhiy Storchaka added the comment: According to your profile results all re functions are 2.5-4 times faster under 2.7.12 than under 2.7.6. May be I misinterpret it? Note that 96-99% of time (2847.099 of 2980.718 seconds under 2.7.6 and 4474.890 of 4519.872 seconds under 2.7.12) is spent in

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

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. Alternatively, make a small set of regular expressions that demonstrate the performance regression. -- nosy: +rhettinger

[issue27898] regexp performance degradation between 2.7.6 and 2.7.12

New submission from Steve Newcomb: Our most regular-expression-processing-intensive Python 2.7 code takes 2.5x more execution time in 2.7.12 than it did in 2.7.6. I discovered this after upgrading from Ubuntu 14.04 to Ubuntu 16.04. Basically this code runs thousands of compiled regular