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[debbugs-tracker] bug#24715: closed (Massive performance regression make

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#24715: closed (Massive performance regression makes diff unusable)
Date: Wed, 26 Oct 2016 06:14:01 +0000

Your message dated Tue, 25 Oct 2016 23:13:21 -0700
with message-id <address@hidden>
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

24715: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24715
GNU Bug Tracking System
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--- Begin Message --- Subject: Massive performance regression makes diff unusable Date: Mon, 17 Oct 2016 15:03:05 +0200 User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)
$ 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 Schwab, SUSE Labs, address@hidden
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

--- End Message ---
--- Begin Message --- Subject: Re: [bug-diffutils] bug#24715: Massive performance regression makes diff unusable Date: Tue, 25 Oct 2016 23:13:21 -0700 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0
Thanks for the test data. I installed a Gnulib patch, noted here:


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

Attachment: 0001-build-update-gnulib-submodule-to-latest.patch
Description: Text Data

Attachment: 0002-diff-fix-big-performance-degradation-in-3.4.patch
Description: Text Data

--- End Message ---

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