GNU bug report logs - #24715
Massive performance regression makes diff unusable

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#24715: closed (Massive performance regression makes diff
 unusable)
Date: Wed, 26 Oct 2016 06:14:01 +0000

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Your message dated Tue, 25 Oct 2016 23:13:21 -0700
with message-id <4b24a328-3563-5441-939d-f6e87552cc2d <at> cs.ucla.edu>
and subject line Re: [bug-diffutils] bug#24715: Massive performance regression makes diff unusable
has caused the debbugs.gnu.org bug report #24715,
regarding Massive performance regression makes diff unusable
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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24715: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24715
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From: Andreas Schwab <schwab <at> suse.de>
To: bug-diffutils <at> gnu.org
Subject: Massive performance regression makes diff unusable
Date: Mon, 17 Oct 2016 15:03:05 +0200

$ wc tmp.*
  6712297  27215448 135217073 tmp.1
  6712247  27215244 135216202 tmp.2
 13424544  54430692 270433275 total

$ diff --version | head -1
diff (GNU diffutils) 3.3
$ time diff -u tmp.* > xx
17.023user 8.246system 0m25.335selapsed 99.74%CPU

$ diff --version | head -1
diff (GNU diffutils) 3.5
$ time diff -u tmp.* > yy
5020.640user 3.176system 83m50.461selapsed 99.86%CPU

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab <at> suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Andreas Schwab <schwab <at> suse.de>
Cc: 24715-done <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#24715: Massive performance regression makes
 diff unusable
Date: Tue, 25 Oct 2016 23:13:21 -0700

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Thanks for the test data. I installed a Gnulib patch, noted here:

http://lists.gnu.org/archive/html/bug-gnulib/2016-10/msg00157.html

along with the attached diffutils patches. This fixed the problem for me, so I 
am closing the bug report.

[0001-build-update-gnulib-submodule-to-latest.patch (text/x-diff, attachment)]

[0002-diff-fix-big-performance-degradation-in-3.4.patch (text/x-diff, attachment)]

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