GNU bug report logs - #71094
[PATCH] Prefer to run find and grep in parallel in rgrep

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Message #62 received at 71094 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Eli Zaretskii <eliz <at> gnu.org>, Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: sbaugh <at> janestreet.com, 71094 <at> debbugs.gnu.org, rgm <at> gnu.org
Subject: Re: bug#71094: [PATCH] Prefer to run find and grep in parallel in
 rgrep
Date: Thu, 23 May 2024 16:24:11 +0300

On 23/05/2024 07:46, Eli Zaretskii wrote:
>> From: Manuel Giraud<manuel <at> ledu-giraud.fr>
>> Cc:dmitry <at> gutov.dev,sbaugh <at> janestreet.com,71094 <at> debbugs.gnu.org,
>>    rgm <at> gnu.org
>> Date: Wed, 22 May 2024 21:15:02 +0200
>>
>> Eli Zaretskii<eliz <at> gnu.org>  writes:
>>
>> [...]
>>
>>> Thanks, but we need the timings of the corresponding Emacs commands,
>>> not the commands run from the shell prompt.
>> Ok.  What are those commands and how to timed them?
> It's rgrep, AFAIU, according to the original report in this bug's
> discussion.  Dmitry, would you please show Manual the commands you
> were running in your benchmarks?

1. Visit a directory with a fair number of files.
2. M-x rgrep, enter some odd regexp like "asdfasf@!#!" and "*" for the 
files wildcard.
3. Perform the search. Look at the end of the *grep* output, it will say 
something like "duration: 4.52 s". Note the number.

And you could repeat the same after applying the patch, recompiling 
Emacs (or at least grep.el) and restarting.

Preferably do the scenario 2-3 times to ensure that the filesystem cache 
is warm, and cold file access speed doesn't skew the numbers.

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