GNU bug report logs - #43631
28.0.50; CC Mode multiline strings grinds performance to a halt

Previous Next

Full log

View this message in rfc822 format

From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Alan Mackenzie <acm <at> muc.de>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#43631: closed (28.0.50; CC Mode multiline strings grinds
 performance to a halt)
Date: Fri, 13 Oct 2023 15:28:02 +0000

[Message part 1 (text/plain, inline)]

Your message dated Fri, 13 Oct 2023 15:26:36 +0000
with message-id <ZSlhrFrRcfkGVvrC <at> ACM>
and subject line Re: bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt
has caused the debbugs.gnu.org bug report #43631,
regarding 28.0.50; CC Mode multiline strings grinds performance to a halt
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
43631: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=43631
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Theodor Thornhill <theo <at> thornhill.no>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; CC Mode multiline strings grinds performance to a halt
Date: Sat, 26 Sep 2020 13:17:29 +0200

Hello there!

While creating a new mode derived from CC Mode, we noticed performance
is affected heavily when setting a character for
'c-multiline-string-start-char'. There is a discussion around this that
can be found at https://github.com/josteink/csharp-mode/issues/164,
and we were given an easily reproducible repo for this. It is verified
to slow typing down both in 'csharp-mode', 'pike-mode' and in this test
case:
https://github.com/unhammer/csharp-mode/tree/164-repro

I think (unconvincingly) that some of the problematic code is situated
around line 2047 in 'cc-mode.el', but this is only a guess taken from
some light profiling.

The issue is described well on github, and I think me trying to
reiterate that here will only cause subtle confusions.

One thing of note is that you don't even have to have any multiline
strings for this performance hit to occur, meaning all 'csharp-mode'
files do suffer from this.

Let me know if something is still unclear, and I'll try to bring up some
more information.

All the best,
Theodor Thornhill

[Message part 3 (message/rfc822, inline)]

From: Alan Mackenzie <acm <at> muc.de>
To: 43631-done <at> debbugs.gnu.org
Subject: Re: bug#43631: 28.0.50; CC Mode multiline strings grinds performance
 to a halt
Date: Fri, 13 Oct 2023 15:26:36 +0000

Hello, Emacs.

This bug was fixed with my commits between 2021-08-12 and 2021-08-14.

Closing.

-- 
Alan Mackenzie (Nuremberg, Germany).

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.