Package: emacs;
Reported by: Olivier Scalbert <olivier.scalbert <at> algosyn.com>
Date: Thu, 23 Jul 2020 11:00:02 UTC
Severity: normal
Fixed in version 27.1
Done: Alan Mackenzie <acm <at> muc.de>
Bug is archived. No further changes may be made.
Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Olivier Scalbert <olivier.scalbert <at> algosyn.com> To: bug-gnu-emacs <at> gnu.org Subject: Emacs is very slow when navigating into a specific C++ file Date: Thu, 23 Jul 2020 09:45:18 +0200
Hi ! With Emacs 26.1 or 26.3 on my Xeon Debian box, I have some problems with the following C++ file: https://github.com/mamedev/mame/blob/master/src/devices/cpu/z80/z80.cpp (which is part of the Mame project). When I open it and press several times the "page down" key, Emacs seems to hang. In fact 100% of the cpu is consumed during 10 to 15 seconds. Then it works well. My Emacs config is nearly empty. The C++ code is a little special as is contains lot of macros, but I can open it and navigate into it without problem with vim or VSCode. If I turn off syntax highlighting, it run smoother. Thanks for the help ! Olivier In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5) of 2019-09-23, modified by Debian built on x86-grnet-01 Windowing system distributor 'The X.Org Foundation', version 11.0.12004000 System Description: Debian GNU/Linux 10 (buster) Recent messages: Loading /etc/emacs/site-start.d/50gnugo.el (source)...done Loading /etc/emacs/site-start.d/50latex-cjk-common.el (source)... Loading /usr/share/emacs/site-lisp/latex-cjk-common/cjk-enc.el (source)...done Loading /etc/emacs/site-start.d/50latex-cjk-common.el (source)...done Loading /etc/emacs/site-start.d/50latex-cjk-thai.el (source)...done Loading /etc/emacs/site-start.d/50openscad.el (source)...done Loading /etc/emacs/site-start.d/50python-docutils.el (source)...done Loading /etc/emacs/site-start.d/50texlive-lang-english.el (source)...done For information about GNU Emacs and the GNU system, type C-h C-a. Making completion list... [2 times] Configured using: 'configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2 -fdebug-prefix-map=/build/emacs-StqULU/emacs-26.1+1=. -fstack-protector-strong -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro' Configured features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LIBSYSTEMD LCMS2 Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: Lisp Interaction Minor modes in effect: tooltip-mode: t global-eldoc-mode: t eldoc-mode: t electric-indent-mode: t mouse-wheel-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 column-number-mode: t line-number-mode: t transient-mark-mode: t Load-path shadows: /usr/share/emacs/site-lisp/rst hides /usr/share/emacs/26.1/lisp/textmodes/rst /usr/share/emacs/site-lisp/latex-cjk-thai/thai-word hides /usr/share/emacs/26.1/lisp/language/thai-word Features: (shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs format-spec rfc822 mml mml-sec epa derived epg gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils elec-pair solarized-dark-theme solarized color dash finder-inf info package easymenu epg-config url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core term/tty-colors 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 composite charscript charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray 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 lcms2 dynamic-setting system-font-setting font-render-setting move-toolbar gtk x-toolkit x multi-tty make-network-process emacs) Memory information: ((conses 16 282823 12891) (symbols 48 28411 2) (miscs 40 50 76) (strings 32 78429 1210) (string-bytes 1 1842487) (vectors 16 21905) (vector-slots 8 611952 8270) (floats 8 277 315) (intervals 56 282 0) (buffers 992 12))
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997,2003 nCipher Corporation Ltd,
1994-97 Ian Jackson.