From: Taylor Venable <taylor@metasyntax.net>
To: help-gnu-emacs@gnu.org, emacs-devel@gnu.org
Subject: Re: Strange slowness when killing words interactively
Date: Sun, 1 May 2011 20:22:37 -0400 [thread overview]
Message-ID: <BANLkTi=mrq9fo8fd0m08hmQo4DC-xi=u7g@mail.gmail.com> (raw)
In-Reply-To: <BANLkTin5-Z+OLzBmMUvt_mh8gFd_isp=Fg@mail.gmail.com>
On Tue, Apr 26, 2011 at 21:30, Taylor Venable <taylor@metasyntax.net> wrote:
> Hi, I'm having a strange problem with C-<backspace>
> (backward-kill-word) and looking for some help in trying to debug it.
> When I use this keystroke, the CPU usage spikes. The same goes for
> C-<delete> (forward-kill-word) or any other key that I bind to either
> of these functions. Other functions, such as backward-kill-sexp and
> backward-kill-sentence, are similarly problematic. As a result, when I
> hold the key down, my high repeat rate makes Emacs unresponsive for a
> second until whatever is slowing down catches up. It happens with the
> GTK GUI, but not with the text user interface. None of my other
> machines have this behaviour with the same version of Emacs (that
> includes one machine which is running the same distribution [Arch
> Linux] with the same packages). No other programs on this system are
> affected by performance problems when deleting words of text from a
> block. The problem occurs with and without using -q. There does not
> seem to be the same problem if I run the kill function itself with
> C-u; for example, C-u 1000 backward-kill-word is instant. What's the
> best way to profile this and figure out where my CPU cycles are being
> eaten? Thanks for any help, my version information is below. I built
> from fully updated bzr trunk tonight.
>
> M-x emacs-version
> GNU Emacs 24.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.22.1) of
> 2011-04-26
>
> gcc --version
> gcc (GCC) 4.6.0 20110415 (prerelease)
>
> uname -a
> Linux system76 2.6.38-ARCH #1 SMP PREEMPT Sun Apr 17 15:18:58 CEST
> 2011 x86_64 Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz GenuineIntel
> GNU/Linux
(Adding emacs-devel since I've started looking at the source code.)
I've found the location where the slowness creeps into kill-word and
friends. Looking at kill-region in simple.el, the part that is very
slow for my system is adding to the kill ring. If I comment those
lines out (as shown in http://paste.lisp.org/+2LWP) then the sluggish
response disappears. It's odd to me that I don't see this behaviour
when I start Emacs with -nw as I would (perhaps naively) think that
slowness in kill-region would be independent of what user interface is
active.
--
Taylor C. Venable
http://metasyntax.net/
next prev parent reply other threads:[~2011-05-02 0:22 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-27 1:30 Strange slowness when killing words interactively Taylor Venable
2011-05-02 0:22 ` Taylor Venable [this message]
2011-05-02 1:13 ` Chong Yidong
2011-05-02 4:25 ` Taylor Venable
2011-05-02 16:32 ` David De La Harpe Golden
2011-05-03 1:14 ` Taylor Venable
2011-05-03 4:30 ` David De La Harpe Golden
2011-05-03 5:12 ` Stephen J. Turnbull
2011-05-03 11:51 ` Taylor Venable
2011-05-04 5:36 ` David De La Harpe Golden
2011-05-07 2:52 ` Taylor Venable
2011-05-09 1:18 ` David De La Harpe Golden
2011-05-09 3:08 ` David De La Harpe Golden
2011-05-14 12:59 ` Taylor Venable
2011-05-16 22:32 ` Chong Yidong
2011-05-16 23:01 ` David De La Harpe Golden
2011-05-17 17:31 ` Chong Yidong
2011-05-17 17:48 ` David De La Harpe Golden
2011-05-17 19:05 ` David De La Harpe Golden
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