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

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From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Eli Zaretskii <eliz <at> gnu.org>, Spencer Baugh <sbaugh <at> janestreet.com>
Cc: rgm <at> gnu.org, 71094 <at> debbugs.gnu.org
Subject: bug#71094: [PATCH] Prefer to run find and grep in parallel in rgrep
Date: Wed, 22 May 2024 15:34:06 +0300

On 22/05/2024 14:59, Eli Zaretskii wrote:

> With how many files did you measure the 40% speedup?  Can you show the
> performance with much fewer and much more files than what you used?

FWIW my test indicated that for a smaller project (such as Emacs) the 
difference is fairly small - the new code is slightly better or the same.

The directory where I saw significant improvement has 300K files.

> I
> suspect that the effect depends on that.  (It also depends on the
> system limit on the number of files and the length of the command line
> that xargs can use.)  The argument about 'find' waiting is no longer
> relevant with 'exec-plus', since in most cases there will be just one
> invocation of 'grep'.

If there's just one invocation, wouldn't that mean that it will happen 
at the end of the full directory scan? Rather than in parallel.

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