GNU bug report logs - #18454
Improve performance when -P (PCRE) is used in UTF-8 locales

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Package: grep;

Reported by: Vincent Lefevre <vincent <at> vinc17.net>

Date: Fri, 12 Sep 2014 01:26:02 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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Message #50 received at 18454 <at> debbugs.gnu.org (full text, mbox):

From: Santiago Ruano Rincón <santiago <at> debian.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 18454 <at> debbugs.gnu.org
Subject: Re: bug#18454: Improve performance when -P (PCRE) is used in UTF-8
 locales
Date: Thu, 18 Sep 2014 10:33:27 +0200

El 17/09/14 a las 23:00, Paul Eggert escribió:
> I've installed all the patches mentioned so far.
> 

I've successfully build the latest commit
(f6de00f6cec3831b8f334de7dbd1b59115627457), but I don't see any
performance boost. Rather the opposite.

Comparing with debian's grep 2.20-3, that includes your first patch to solve
this -P issue, 0001-grep-P-invalid-utf8-non-matching.patch:

grep -P asdf /usr/bin/*  12,42s user 0,12s system 99% cpu 12,545 total
src/grep -P asdf /usr/bin/*  14,37s user 0,12s system 99% cpu 14,492 total

Note that basic grep also slowdowns:

grep asdf /usr/bin/*  0,22s user 0,16s system 99% cpu 0,382 total
src/grep asdf /usr/bin/*  1,26s user 0,12s system 99% cpu 1,384 total

Cheers, and thanks for your work,

Santiago
This bug report was last modified 3 years and 181 days ago.

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