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

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

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."

Message #8 received at 24715 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Andreas Schwab <schwab <at> suse.de>, 24715 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#24715: Massive performance regression makes
 diff unusable
Date: Thu, 20 Oct 2016 15:25:23 -0700

Thanks, can you make the data files available so we can reproduce the 
problem?

Message #11 received at 24715 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> suse.de>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 24715 <at> debbugs.gnu.org
Subject: Re: [bug-diffutils] bug#24715: Massive performance regression makes
 diff unusable
Date: Mon, 24 Oct 2016 10:50:45 +0200

https://bugzilla.opensuse.org/attachment.cgi?id=698854

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."

Message #16 received at 24715-done <at> debbugs.gnu.org (full text, mbox):

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

[Message part 1 (text/plain, inline)]

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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