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bug#10539: 24.0.92; low display-time-interval makes Emacs slow
From: |
Michael Heerdegen |
Subject: |
bug#10539: 24.0.92; low display-time-interval makes Emacs slow |
Date: |
Wed, 18 Jan 2012 02:52:03 +0100 |
Hello,
in emacs -Q, set `display-time-interval' to 1 and enable
`display-time-mode'.
The docstring of `display-time-interval' says "Seconds between updates
of time in the mode line.". Ok, fine. The doc of
`display-time-string-forms' includes an example which makes
`display-time-mode' show seconds. So, the user may think setting
`display-time-interval' to 1 is a good idea.
But it is currently not, on the contrary.
First of all, `display-time-update' is a long, complex function.
Running only its calculations every second consumes some percent CPU by
itself.
Second, the doc of `display-time-update' says
Update the display-time info for the mode line.
However, don't redisplay right now.
But it _does_ redisplay, it calls `force-mode-line-update' explicitly at
the end of the code!
If I redefine `display-time-update' so that it doesn't call
`force-mode-line-update', the update of the time in the mode-line
surprisingly still works, I get an update every second. So, maybe the
call to `force-mode-line-update' can be removed.
Now I disable global font lock and such CPU eating minor mode stuff. I
visit my ~/.newsrc.eld which has 647k. My CPU consumption gets nearly
100%, it takes several seconds until q (`View-quit') gets processed. If
I visit that file with `display-time-mode' off, that doesn't happen.
So, at the end, you could try to make `display-time-mode' more
effective. If `display-time-update' does redisplay, then the doc should
say so. And if we can't improve things, then the docstring of
`display-time-interval' should say that low values are
deprecated because they decrease Emacs' performance.
Thanks,
Michael.
In GNU Emacs 24.0.92.1 (i486-pc-linux-gnu, GTK+ Version 3.2.3)
of 2012-01-11 on zelenka, modified by Debian
(emacs-snapshot package, version 1:20120111-1)
Windowing system distributor `The X.Org Foundation', version 11.0.11102902
configured using `configure '--build' 'i486-linux-gnu' '--host'
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
'--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/24.0.92/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.0.92/site-lisp:/usr/share/emacs/site-lisp'
'--without-compress-info' '--with-crt-dir=/usr/lib/i386-linux-gnu/'
'--with-x=yes' '--with-x-toolkit=gtk3' '--with-imagemagick=yes'
'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN
-DSITELOAD_PURESIZE_EXTRA=5000 -g -O2''
Important settings:
value of $LC_ALL: de_DE.utf8
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: C
value of $LANG: de_DE.utf8
value of $XMODIFIERS: nil
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t
- bug#10539: 24.0.92; low display-time-interval makes Emacs slow,
Michael Heerdegen <=
- bug#10539: 24.0.92; low display-time-interval makes Emacs slow, Glenn Morris, 2012/01/27
- bug#10539: 24.0.92; low display-time-interval makes Emacs slow, Eli Zaretskii, 2012/01/28
- bug#10539: 24.0.92; low display-time-interval makes Emacs slow, Glenn Morris, 2012/01/28
- bug#10539: 24.0.92; low display-time-interval makes Emacs slow, Eli Zaretskii, 2012/01/28
- bug#10539: 24.0.92; low display-time-interval makes Emacs slow, Glenn Morris, 2012/01/28
- bug#10539: 24.0.92; low display-time-interval makes Emacs slow, Eli Zaretskii, 2012/01/28
- bug#10539: 24.0.92; low display-time-interval makes Emacs slow, Glenn Morris, 2012/01/29
- bug#10539: 24.0.92; low display-time-interval makes Emacs slow, Drew Adams, 2012/01/29