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bug#23327: 25.0.92; show-trailing-whitespace uses too much cpu
From: |
Mohammed Sadik |
Subject: |
bug#23327: 25.0.92; show-trailing-whitespace uses too much cpu |
Date: |
Thu, 21 Apr 2016 11:33:55 +0530 |
Enabling show-trailing-whitespace and navigating through buffer uses too
much CPU. An increase of about 4-6% of CPU on my 2.4 GHz Quad-core
system.
How to reproduce:
1. Open a large source code file (I opened cc-engine.el from Emacs source).
2. Enable show-trailing-whitespace (setq show-trailing-whitespace t)
3. Press and hold the arrow keys to navigate. See the processor usage
(use top/htop or similar program).
4. Now disable show-trailing-whitespace (setq show-trailing-whitespace
nil)
5. Repeat 3
This also happens when pressing any other key (eg:while typing).
Also this creates minor glitches in displaying text on buffer
(sudden disappearance and appearence of some text) when CPU is already
enough busy.
In GNU Emacs 25.0.92.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
of 2016-04-20 built on fedora.localdomain
Windowing system distributor 'Fedora Project', version 11.0.11800000
Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS
LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11
Important settings:
value of $LC_MONETARY: en_IN.UTF-8
value of $LC_NUMERIC: en_IN.UTF-8
value of $LC_TIME: en_IN.UTF-8
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: Emacs-Lisp
Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
t
Mark set [2 times]
nil
Making completion list...
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec epg epg-config gnus-util mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util help-fns help-mode easymenu cl-loaddefs pcase
cl-lib mail-prsvr mail-utils time-date mule-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
dbusbind inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)
Memory information:
((conses 16 89437 9618)
(symbols 48 19612 0)
(miscs 40 83 185)
(strings 32 14290 4341)
(string-bytes 1 410796)
(vectors 16 11670)
(vector-slots 8 421100 7008)
(floats 8 166 119)
(intervals 56 962 0)
(buffers 976 13)
(heap 1024 35720 1005))
- bug#23327: 25.0.92; show-trailing-whitespace uses too much cpu,
Mohammed Sadik <=