GNU bug report logs - #64735
29.0.92; find invocations are ~15x slower because of ignores

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From: Spencer Baugh <sbaugh <at> janestreet.com>
To: Ihor Radchenko <yantar92 <at> posteo.net>
Cc: Dmitry Gutov <dmitry <at> gutov.dev>, 64735 <at> debbugs.gnu.org
Subject: bug#64735: 29.0.92; find invocations are ~15x slower because of ignores
Date: Fri, 21 Jul 2023 16:11:31 -0400

Ihor Radchenko <yantar92 <at> posteo.net> writes:
> Spencer Baugh <sbaugh <at> janestreet.com> writes:
>
>>> Does find use multiple CPU cores?
>>
>> Not on its own, but when it's running as a separate subprocess of Emacs,
>> that subprocess can (and will, on modern core-rich hardware) run on a
>> different CPU core from Emacs itself.  That's a form of parallelism
>> which is very achievable for Emacs, and provides a big performance win.
>
> AFAIU, the way find is called by project.el is synchronous: (1) call
> find; (2) wait until it produces all the results; (3) process the
> results. In such scenario, there is no gain from subprocess.
>
> Is any part of Emacs is even using sentinels together with find?

rgrep.

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