GNU bug report logs - #58558
29.0.50; re-search-forward is slow in some buffers

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 58558 <at> debbugs.gnu.org, yantar92 <at> posteo.net, monnier <at> iro.umontreal.ca
Subject: bug#58558: 29.0.50; re-search-forward is slow in some buffers
Date: Tue, 18 Oct 2022 17:58:59 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>,  58558 <at> debbugs.gnu.org,  Eli
>  Zaretskii <eliz <at> gnu.org>
> Date: Tue, 18 Oct 2022 13:50:02 +0200
> 
> The slowdowns are so dramatic that they should show up on a profiler --
> which might give us a clue which parts of Emacs is slowing down.

Right.

> I briefly tried to use "perf" under Linux to connect to a running
> Emacs and get some data out of it, but...  er...  I've never used it
> before, and...
> 
> Does anybody have a recipe for how to do runtime function tracing for a
> running process?

The way I run perf is to start Emacs under perf to begin with.

What did you try?  It was quite simple, AFAIR, last time I tried.

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