--- Begin Message ---
Subject: |
Emacs 24 hangs for several minutes with very large c++ files |
Date: |
Mon, 28 Nov 2011 00:04:18 +0100 |
Hi Emacs devs,
I am seeing a weird problem. I have an automatically generated C++ class
for some ntupled data for quick (but dirty) analysis. It has lots of
(~1k) data members. Every time I try to navigate in that file and I
reach the large block of text where the data members are declared[1],
Emacs takes a long time to move the cursor (e.g. with commands like
forward-paragraph or backward-paragraph) and the CPU usage on my
Thinkpad X201 maxes out on one of the 4 logical cores. If I wait long
enough (several minutes), Emacs 24 does manage to move the cursor to the
end of the paragraph. However I don't see this problem with Emacs 23.3.1
(or vim).
I can replicate this behaviour with `emacs -Q'. The file that causes the
issue is attached with this email. I am using Emacs from the repo.or.cz
git mirror.
commit aecaa1ffa122258c0fbc580ccbfad268ea46b89d
Author: Andreas Schwab <address@hidden>
Date: Sat Nov 26 10:10:36 2011 +0100
* grammars/bovine-grammar.el (bovine--grammar-newstyle-unquote):
Avoid warning about old-style backquote.
This is how I compile emacs:
In GNU Emacs 24.0.91.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.7)
of 2011-11-27 on mylaptop.example.com
configured using `configure '--prefix=/opt/emacs-lisp'
'--with-selinux' '--with-imagemagick''
Important settings:
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE: nil
value of $LC_MESSAGES: nil
value of $LC_MONETARY: nil
value of $LC_NUMERIC: nil
value of $LC_TIME: nil
value of $LANG: en_IN.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t
Since I don't actually get a backtrace, I am not sure what else I can
provide. Please feel free to ask me if you need more information.
Hope this helps.
Footnotes:
[1] The large chunk of commented text in the attached file
--
Suvayu
Open source is the future. It sets us free.
bug.hxx
Description: Text document
--- End Message ---
--- Begin Message ---
Subject: |
Re: bug#10149: Emacs 24 hangs for several minutes with very large c++ files |
Date: |
Sat, 2 Nov 2019 13:07:42 +0000 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
Hello, Stefan.
On Sat, Nov 02, 2019 at 11:31:09 +0100, Stefan Kangas wrote:
> Hi Alan,
> Alan Mackenzie <address@hidden> writes:
> > The solution is to supply a limit to that search. I think the following
> > patch should do the job. For me it speeds up a complete scroll from
> > beginning to end of buffer by a factor of ~4:
> I tried your patch and yes, it seems to work much better.
> Thank you for the prompt fix.
Thanks for the quick test. I'm closing the bug with this post.
> Best regards,
> Stefan Kangas
--
Alan Mackenzie (Nuremberg, Germany).
--- End Message ---