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

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.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 20:19:24 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> 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.

I thought it might be easier to see the differences in results if one
first attached perf to a fresh (fast) Emacs and got the trace, and the
waited until Emacs got slow, and repeated the same thing under another
trace.

perf is able to do this by:

perf record -p <PID> -g

and

perf report

then shows me stuff, but I don't even know what to look for when
interpreting that.  Or whether perf is, indeed, the right too for this
task.

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