--- Begin Message ---
Subject: |
25.3; slow comment c++-mode |
Date: |
Tue, 06 Mar 2018 21:25:56 +0200 |
1. Open the following file (make sure you have write privilege)
https://raw.githubusercontent.com/opencog/atomspace/master/tests/unify/
UnifyUTest.cxxtest
2. Enable c++-mode (M-x c++-mode)
3. Mark a large region of that file (say l.175 to the end)
4. Comment out that region (M-;)
5. Meditate in the church of Emacs for a few minutes
If c++-mode is disabled (using fundamental-mode for instance)
commenting
that same region is instantaneous. After running some profiling it
seems
most of the CPU resources is spent in c-syntactic-skip-backward.
The same slowness occurs with Emacs 25.1. I couldn't try older versions
due to temacs Segfault compiling issue (unresolved by disabling
randomize_va_space).
In GNU Emacs 25.3.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.22.19)
of 2017-09-15 built on buildvm-31.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.11906000
Configured using:
'configure --build=x86_64-redhat-linux-gnu
--host=x86_64-redhat-linux-gnu --program-prefix=
--disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
--bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
--datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
--libexecdir=/usr/libexec --localstatedir=/var
--sharedstatedir=/var/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-
png
--with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
--with-gpm=no --with-xwidgets --with-modules
build_alias=x86_64-redhat-linux-gnu host_alias=x86_64-redhat-linux-gnu
'CFLAGS=-DMAIL_USE_LOCKF -O2 -g -pipe -Wall -Werror=format-security
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
--param=ssp-buffer-size=4 -grecord-gcc-switches
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic'
LDFLAGS=-Wl,-z,relro
PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'
Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS
NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES XWIDGETS
Important settings:
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: C++/l
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
abbrev-mode: t
Recent messages:
Saved text until ", ts_expected));
}
#undef al
#undef an
"
Mark set [2 times]
Saved text from "#include <opencog/util/Logger.h>
#inclu"
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec password-cache 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 mail-prsvr mail-utils
cl-extra help-mode cc-mode cc-fonts easymenu cc-guess cc-menus cc-cmds
cc-styles cc-align cc-engine cc-vars cc-defs cl-loaddefs pcase cl-lib
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 xwidget-internal move-toolbar
gtk x-toolkit x multi-tty make-network-process emacs)
Memory information:
((conses 16 136237 5145)
(symbols 48 21890 0)
(miscs 40 56 157)
(strings 32 19783 4769)
(string-bytes 1 778551)
(vectors 16 14190)
(vector-slots 8 458261 5239)
(floats 8 167 43)
(intervals 56 9646 10)
(buffers 976 18))
--- End Message ---
--- Begin Message ---
Subject: |
Re: bug#30735: (no subject) |
Date: |
Wed, 4 Apr 2018 16:31:08 +0000 |
User-agent: |
Mutt/1.7.2 (2016-11-26) |
Bug (excessively slow comment-region in CC-Mode) fixed by these commits:
eb0d10d567af76967d8e738e51a79ef4998470b7
424103a6e351a6d2d8b94f86998c90fdf6afea27
b393ecf8e288f1e1b6a8ac55006715fa1046a5d4
.
--
Alan Mackenzie (Nuremberg, Germany).
--- End Message ---