GNU bug report logs - #63225
Compiling regexp patterns (and REGEXP_CACHE_SIZE in search.c)

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Package: emacs;

Reported by: Ihor Radchenko <yantar92 <at> posteo.net>

Date: Tue, 2 May 2023 07:35:02 UTC

Severity: normal

Tags: patch

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From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Ihor Radchenko <yantar92 <at> posteo.net>
Cc: 63225 <at> debbugs.gnu.org
Subject: bug#63225: Compiling regexp patterns (and REGEXP_CACHE_SIZE in search.c)
Date: Wed, 3 May 2023 17:20:52 +0200

3 maj 2023 kl. 17.05 skrev Ihor Radchenko <yantar92 <at> posteo.net>:

> (cond ((looking-at-p ...) ...)) gives
> 
> misses: 1493570
> hits: 3225203
> % misses from total: 31%
> 
> giant rx + looking-at gives
> 
> misses: 1177242
> hits: 3233553
> % misses from total: 27%

Maybe you should instrument the regexp engine and log the pattern and whether compilation was needed to a file. Run on a reduced dataset, and see if the sequence of regexps being exercised, and their frequencies, are consistent with what you expect.
This bug report was last modified 2 years and 38 days ago.

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