* bug#14051: Fwd: 24.3; Slow scrolling in term modes [not found] <CAPAn_E3hDyk=O+Bwi3mLbCfXkUaxTHXW35ihGgTUK-oAZqOpbw@mail.gmail.com> @ 2013-03-25 4:42 ` Bryan Bishop 2019-09-30 16:19 ` Stefan Kangas 2021-08-23 1:06 ` Lars Ingebrigtsen 0 siblings, 2 replies; 6+ messages in thread From: Bryan Bishop @ 2013-03-25 4:42 UTC (permalink / raw) To: 14051 This bug report will be sent to the Bug-GNU-Emacs mailing list and the GNU bug tracker at debbugs.gnu.org. Please check that the From: line contains a valid email address. After a delay of up to one day, you should receive an acknowledgment at that address. Please write in English if possible, as the Emacs maintainers usually do not have translators for other languages. Please describe exactly what actions triggered the bug, and the precise symptoms of the bug. If you can, give a recipe starting from `emacs -Q': The window scrolling performance ("multi-term" and plain old "term" in this case) in emacs 24 is terrible after a few thousand lines of scrollback, slowly getting worse and worse and after about 5000 lines of scrollback takes about a 1/2 second to render the next chunk of text. How I can replicate the problem: emacs -Q M-x term find / (The output of the find command whizzes by, and then starts to get jerky and slow when scrollback history is > 2000 lines) I've installed the stock emacs24 from linux mint/ubuntu packages (24.1.1), and a custom compiled version of 24.3.1 without any special tricks and a compiler option of -O3 and the term mode behavior is all the same, and this behavior even shows up with "emacs -Q". It seems the same with multi-term, ansi-term, nterm, it doesn't matter. This does work very fast in eshell and in terminal-emulator mode. What is weird is ALL the terminal modes in Emacs 23 seem to work great, but not Emacs 24. Any ideas how I can make this mode faster? My suspicion was around font-lock-mode but I've turned that off with no effect. The fact that it is still slow without my init file using -Q and seems to be really fast in Emacs 23 has me stumped. If Emacs crashed, and you have the Emacs process in the gdb debugger, please include the output from the following gdb commands: `bt full' and `xbacktrace'. For information about debugging Emacs, please read the file /usr/local/share/emacs/24.3/etc/DEBUG. In GNU Emacs 24.3.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars) of 2013-03-13 on badwolf Windowing system distributor `The X.Org Foundation', version 11.0.11300000 System Description: Linux Mint 14 Nadia Configured using: `configure '--prefix=/usr/local' 'CFLAGS=-O3'' Important settings: value of $LC_CTYPE: en_US.UTF-8 value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: Buffer Menu Minor modes in effect: tooltip-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 buffer-read-only: t line-number-mode: t transient-mark-mode: t Recent input: C-x 1 M-x t e r m <return> <return> f i n d <return> C-c C-c C-c C-c C-c C-c e x i t <return> Recent messages: byte-code: Beginning of buffer [14 times] Quit [2 times] Mark set Sending... Already sent message via mail; resend? (y or n) y Mark set [2 times] Sending via mail... Sending...done Mark set Saved text from "The window scrolling performance ("multi" Load-path shadows: None found. Features: (mule-util mailalias mailclient browse-url cus-edit cus-start cus-load wid-edit shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils term disp-table ehelp electric ring help-mode easymenu time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process dbusbind dynamic-setting system-font-setting font-render-setting x-toolkit x multi-tty emacs) ^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#14051: Fwd: 24.3; Slow scrolling in term modes 2013-03-25 4:42 ` bug#14051: Fwd: 24.3; Slow scrolling in term modes Bryan Bishop @ 2019-09-30 16:19 ` Stefan Kangas 2019-09-30 16:44 ` Eli Zaretskii 2019-09-30 21:35 ` Phil Sainty 2021-08-23 1:06 ` Lars Ingebrigtsen 1 sibling, 2 replies; 6+ messages in thread From: Stefan Kangas @ 2019-09-30 16:19 UTC (permalink / raw) To: Bryan Bishop; +Cc: 14051 Bryan Bishop <bryanjbishop@yahoo.com> writes: > The window scrolling performance ("multi-term" and plain old "term" in > this case) in emacs 24 is terrible after a few thousand lines of > scrollback, slowly getting worse and worse and after about 5000 lines of > scrollback takes about a 1/2 second to render the next chunk of text. > > How I can replicate the problem: > > emacs -Q > M-x term > find / > > (The output of the find command whizzes by, and then starts to get jerky > and slow when scrollback history is > 2000 lines) > > I've installed the stock emacs24 from linux mint/ubuntu packages > (24.1.1), and a custom > compiled version of 24.3.1 without any special tricks and a compiler > option of -O3 and the term mode behavior is all the same, and this > behavior even shows up with "emacs -Q". > > It seems the same with multi-term, ansi-term, nterm, it doesn't matter. > This does work very fast in eshell and in terminal-emulator mode. > What is weird is ALL the terminal modes in Emacs 23 seem to work > great, but not Emacs 24. > > Any ideas how I can make this mode faster? My suspicion was around > font-lock-mode but I've turned that off with no effect. The fact that > it is still slow without my init file using -Q and seems to be really > fast in Emacs 23 has me stumped. Yes. Both term and ansi-term and significantly slower than eshell when running "find /". I had a suspicion that it was because of term-buffer-maximum-size, but setting this to 0 made no difference. (BTW, maybe the default term-buffer-maximum-size should be raised from the default 2048? For example to (* 4 2048).) Best regards, Stefan Kangas ^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#14051: Fwd: 24.3; Slow scrolling in term modes 2019-09-30 16:19 ` Stefan Kangas @ 2019-09-30 16:44 ` Eli Zaretskii 2019-09-30 21:35 ` Phil Sainty 1 sibling, 0 replies; 6+ messages in thread From: Eli Zaretskii @ 2019-09-30 16:44 UTC (permalink / raw) To: Stefan Kangas; +Cc: 14051, bryanjbishop > Date: Mon, 30 Sep 2019 18:19:25 +0200 > Cc: 14051@debbugs.gnu.org > > Yes. Both term and ansi-term and significantly slower than eshell when > running "find /". If you customize your shell prompt to include a newline (i.e produce an empty line), does it help to produce faster scrolling? ^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#14051: Fwd: 24.3; Slow scrolling in term modes 2019-09-30 16:19 ` Stefan Kangas 2019-09-30 16:44 ` Eli Zaretskii @ 2019-09-30 21:35 ` Phil Sainty 1 sibling, 0 replies; 6+ messages in thread From: Phil Sainty @ 2019-09-30 21:35 UTC (permalink / raw) To: Stefan Kangas; +Cc: 14051, Bryan Bishop If this bug is still about Emacs 24, does the following help? ;; Terminal buffer configuration. (add-hook 'term-mode-hook 'my-term-mode-hook) (defun my-term-mode-hook () ;; https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20611 (setq bidi-paragraph-direction 'left-to-right)) You would only need to use this hook for Emacs 24.x -- this particular issue was dealt with by default in Emacs 25+. -Phil ^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#14051: Fwd: 24.3; Slow scrolling in term modes 2013-03-25 4:42 ` bug#14051: Fwd: 24.3; Slow scrolling in term modes Bryan Bishop 2019-09-30 16:19 ` Stefan Kangas @ 2021-08-23 1:06 ` Lars Ingebrigtsen 2021-09-21 5:40 ` Lars Ingebrigtsen 1 sibling, 1 reply; 6+ messages in thread From: Lars Ingebrigtsen @ 2021-08-23 1:06 UTC (permalink / raw) To: Bryan Bishop; +Cc: 14051 Bryan Bishop <bryanjbishop@yahoo.com> writes: > How I can replicate the problem: > > emacs -Q > M-x term > find / > > (The output of the find command whizzes by, and then starts to get jerky > and slow when scrollback history is > 2000 lines) (I'm going through old bug reports that unfortunately weren't resolved at the time.) I tried reproducing this in Emacs 28, but I can't see any particular slowdowns in this situation. Are you still seeing this issue in recent Emacs versions? -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no ^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#14051: Fwd: 24.3; Slow scrolling in term modes 2021-08-23 1:06 ` Lars Ingebrigtsen @ 2021-09-21 5:40 ` Lars Ingebrigtsen 0 siblings, 0 replies; 6+ messages in thread From: Lars Ingebrigtsen @ 2021-09-21 5:40 UTC (permalink / raw) To: Bryan Bishop; +Cc: 14051 Lars Ingebrigtsen <larsi@gnus.org> writes: > I tried reproducing this in Emacs 28, but I can't see any particular > slowdowns in this situation. Are you still seeing this issue in recent > Emacs versions? More information was requested, but no response was given within a month, so I'm closing this bug report. If the problem still exists, please respond to this email and we'll reopen the bug report. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no ^ permalink raw reply [flat|nested] 6+ messages in thread
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[not found] <CAPAn_E3hDyk=O+Bwi3mLbCfXkUaxTHXW35ihGgTUK-oAZqOpbw@mail.gmail.com>
2013-03-25 4:42 ` bug#14051: Fwd: 24.3; Slow scrolling in term modes Bryan Bishop
2019-09-30 16:19 ` Stefan Kangas
2019-09-30 16:44 ` Eli Zaretskii
2019-09-30 21:35 ` Phil Sainty
2021-08-23 1:06 ` Lars Ingebrigtsen
2021-09-21 5:40 ` Lars Ingebrigtsen
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