Package: emacs;
Reported by: Aaron Jensen <aaronjensen <at> gmail.com>
Date: Wed, 14 Feb 2018 16:51:01 UTC
Severity: normal
Merged with 3219, 4123, 9589, 13675, 15555, 18530, 22143, 24523, 32523, 40007
Found in versions 23.1, 24.2, 24.2.93, 24.3, 24.5, 26.0.91, 27.0.50, 28.0.50
Fixed in version 29.1
Done: Lars Ingebrigtsen <larsi <at> gnus.org>
Bug is archived. No further changes may be made.
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bug-gnu-emacs <at> gnu.org
:bug#30457
; Package emacs
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(Wed, 14 Feb 2018 16:51:01 GMT) Full text and rfc822 format available.Aaron Jensen <aaronjensen <at> gmail.com>
:bug-gnu-emacs <at> gnu.org
.
(Wed, 14 Feb 2018 16:51:02 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Aaron Jensen <aaronjensen <at> gmail.com> To: bug-gnu-emacs <at> gnu.org Subject: 26.0.91; bidi-display-reordering makes navigation around melpa/archive-contents slow Date: Wed, 14 Feb 2018 08:49:58 -0800
In this thread, Eli asked for a real world repro where bidi-display-reordering slows down emacs: https://www.reddit.com/r/emacs/comments/7wezb4/how_can_i_make_line_rendering_faster/ I found that today, so I wanted to report it. Download: https://melpa.org/packages/archive-contents emacs -Q archive-contents Press and hold C-n (I have a very fast key repeat rate) On my machine, it takes about 13 seconds to get to the bottom of the window (where it first scrolls, not the bottom of the buffer, I don't have the patience for that). (setq bidi-display-reordering nil) Press and hold C-n On my machine, it takes about 1 second to get to the bottom of the window. This a profile when it is `t`: - command-execute 5643 99% - call-interactively 5643 99% - funcall-interactively 5157 91% - next-line 4880 86% - line-move 4880 86% line-move-visual 2439 43% + execute-extended-command 160 2% + minibuffer-complete 117 2% + byte-code 486 8% + ... 3 0% I hope that this is a compelling enough use-case. I don't believe I have a use-case for it to be `t` right now, so I'll be setting it to `nil` by default in my config, but I wanted to report this because of the aforementioned thread. Thanks! In GNU Emacs 26.0.91 (build 1, x86_64-apple-darwin17.3.0, NS appkit-1561.20 Version 10.13.2 (Build 17C205)) of 2018-01-13 built on aaron-mbt.local Repository revision: 5dd0e5c54d29e81c07798a124295c8c3f016d621 Windowing system distributor 'Apple', version 10.3.1561 Recent messages: /Users/aaronjensen/.emacs.d/.cache/work.org Decrypting /Users/aaronjensen/Dropbox (Personal)/Family Notes/health.org.gpg...done Error running timer: (error "Agenda file ~/Dropbox (Personal)/Family Notes/health.org.gpg is not in Org mode") Appointment reminders enabled (no diary file found) Added 5 events for today Quit [2 times] user-error: Previous command was not an evil-paste: keyboard-quit <nil> <down-mouse-1> is undefined <nil> <mouse-1> is undefined Quit [2 times] Configured using: 'configure --disable-dependency-tracking --disable-silent-rules --enable-locallisppath=/usr/local/share/emacs/site-lisp --infodir=/usr/local/Cellar/emacs-plus/HEAD-5dd0e5c/share/info/emacs --prefix=/usr/local/Cellar/emacs-plus/HEAD-5dd0e5c --with-xml2 --without-dbus --with-gnutls --with-imagemagick --with-modules --with-rsvg --with-ns --disable-ns-self-contained' Configured features: JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES LCMS2 Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: Fundamental Minor modes in effect: magit-auto-revert-mode: t company-statistics-mode: t company-childframe-mode: t eros-mode: t yas-global-mode: t yas-minor-mode: t global-git-gutter+-mode: t git-gutter+-mode: t global-git-commit-mode: t async-bytecomp-package-mode: t recentf-mode: t desktop-save-mode: t auto-dim-other-buffers-mode: t global-wakatime-mode: t wakatime-mode: t global-spacemacs-whitespace-cleanup-mode: t spacemacs-whitespace-cleanup-mode: t ws-butler-global-mode: t ws-butler-mode: t winum-mode: t winner-mode: t pupo-mode: t purpose-mode: t volatile-highlights-mode: t global-vi-tilde-fringe-mode: t vi-tilde-fringe-mode: t save-place-mode: t savehist-mode: t projectile-rails-global-mode: t projectile-mode: t persp-mode: t global-origami-mode: t origami-mode: t Info-breadcrumbs-in-mode-line-mode: t flycheck-pos-tip-mode: t global-flycheck-mode: t flx-ido-mode: t eyebrowse-mode: t global-evil-surround-mode: t evil-surround-mode: t global-evil-search-highlight-persist: t show-smartparens-global-mode: t show-smartparens-mode: t evil-lion-mode: t evil-escape-mode: t eval-sexp-fu-flash-mode: t editorconfig-mode: t dtrt-indent-mode: t global-anzu-mode: t anzu-mode: t counsel-mode: t ivy-mode: t delete-selection-mode: t clean-aindent-mode: t hybrid-mode: t which-key-mode: t override-global-mode: t global-undo-tree-mode: t undo-tree-mode: t evil-mode: t evil-local-mode: t spacemacs-leader-override-mode: t global-spacemacs-leader-override-mode: t diff-auto-refine-mode: t global-hl-line-mode: t xterm-mouse-mode: t global-auto-revert-mode: t shell-dirtrack-mode: t ido-vertical-mode: t 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bug-gnu-emacs <at> gnu.org
:bug#30457
; Package emacs
.
(Wed, 14 Feb 2018 18:41:01 GMT) Full text and rfc822 format available.Message #8 received at 30457 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Aaron Jensen <aaronjensen <at> gmail.com> Cc: 30457 <at> debbugs.gnu.org Subject: Re: bug#30457: 26.0.91; bidi-display-reordering makes navigation around melpa/archive-contents slow Date: Wed, 14 Feb 2018 20:40:10 +0200
> From: Aaron Jensen <aaronjensen <at> gmail.com> > Date: Wed, 14 Feb 2018 08:49:58 -0800 > > In this thread, Eli asked for a real world repro where > bidi-display-reordering slows down emacs: > https://www.reddit.com/r/emacs/comments/7wezb4/how_can_i_make_line_rendering_faster/ > > I found that today, so I wanted to report it. > > Download: https://melpa.org/packages/archive-contents > > emacs -Q archive-contents > > Press and hold C-n (I have a very fast key repeat rate) > > On my machine, it takes about 13 seconds to get to the bottom of the > window (where it first scrolls, not the bottom of the buffer, I don't > have the patience for that). > > (setq bidi-display-reordering nil) > > Press and hold C-n > > On my machine, it takes about 1 second to get to the bottom of the > window. It's a 870K line with multi-level parentheses. As already mentioned there, the BPA implementation that is part of the bidi reordering makes this sluggish due to the many parentheses in such a long line. (However, it's nowhere near 13 sec on my box. And going several lines in one go, as in "C-u 20 C-n", makes it even faster.) > I hope that this is a compelling enough use-case. I don't believe I have > a use-case for it to be `t` right now, so I'll be setting it to `nil` by > default in my config Beware: the code which is used when bidi-display-reordering is nil is unsupported since Emacs 24, so you are on your own when using it. I urge you to reconsider.
bug-gnu-emacs <at> gnu.org
:bug#30457
; Package emacs
.
(Wed, 14 Feb 2018 19:23:02 GMT) Full text and rfc822 format available.Message #11 received at 30457 <at> debbugs.gnu.org (full text, mbox):
From: Aaron Jensen <aaronjensen <at> gmail.com> To: Eli Zaretskii <eliz <at> gnu.org> Cc: 30457 <at> debbugs.gnu.org Subject: Re: bug#30457: 26.0.91; bidi-display-reordering makes navigation around melpa/archive-contents slow Date: Wed, 14 Feb 2018 11:22:37 -0800
On Wed, Feb 14, 2018 at 10:40 AM, Eli Zaretskii <eliz <at> gnu.org> wrote: > It's a 870K line with multi-level parentheses. As already mentioned > there, the BPA implementation that is part of the bidi reordering > makes this sluggish due to the many parentheses in such a long line. Yes, it's also a real use-case that I encountered today while trying to figure out why a package was getting installed (I'm sure there's a better way to do this... but that's not the point). It's not just line scrolling, it's most any manipulation/navigation of the buffer. Emacs has definitely sped up in the last year and I'm quite pleased with that, but this is still one area that it's rather sluggish. I do experience sluggishness in other instances as well with long lines, but this is the example I have today. > (However, it's nowhere near 13 sec on my box. Are you on a mac? It seems we're slower than linux still... Is there a way to check to see if I was compiled w/ optimizations? I used the emacs-plus recipe on homebrew. > And going several lines > in one go, as in "C-u 20 C-n", makes it even faster.) Sure, but everything has a latency and these sort of workaround don't really solve the overall feel problem. It feels like I'm working over ssh to a server in another country and the difference when bidi is disabled is incredible. > Beware: the code which is used when bidi-display-reordering is nil is > unsupported since Emacs 24, so you are on your own when using it. I > urge you to reconsider. I didn't know this, I'm not sure what it means in practice. Perhaps I'll turn it back to t for now and just have that in my bag of tricks if I encounter a file that has this problem. Thanks, Aaron
bug-gnu-emacs <at> gnu.org
:bug#30457
; Package emacs
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(Wed, 14 Feb 2018 19:52:01 GMT) Full text and rfc822 format available.Message #14 received at 30457 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Aaron Jensen <aaronjensen <at> gmail.com> Cc: 30457 <at> debbugs.gnu.org Subject: Re: bug#30457: 26.0.91; bidi-display-reordering makes navigation around melpa/archive-contents slow Date: Wed, 14 Feb 2018 21:51:22 +0200
> From: Aaron Jensen <aaronjensen <at> gmail.com> > Date: Wed, 14 Feb 2018 11:22:37 -0800 > Cc: 30457 <at> debbugs.gnu.org > > > (However, it's nowhere near 13 sec on my box. > > Are you on a mac? No, Windows. > Is there a way to check to see if I was compiled w/ optimizations? What is your value of system-configuration-options? > > And going several lines > > in one go, as in "C-u 20 C-n", makes it even faster.) > > Sure, but everything has a latency and these sort of workaround don't > really solve the overall feel problem. It feels like I'm working over > ssh to a server in another country and the difference when bidi is > disabled is incredible. Only at the beginning of the file. Try the same near the end, and you will see that both are very slow: a single C-n or C-p takes about 2 sec with bidi-display-reordering at nil, and 4 to 5 sec with non-nil. Not a very spectacular speedup. > > Beware: the code which is used when bidi-display-reordering is nil is > > unsupported since Emacs 24, so you are on your own when using it. I > > urge you to reconsider. > > I didn't know this, I'm not sure what it means in practice. It means that we kept the non-reordering code for testing purposes only, so it is very rarely executed, and thus less reliable than the rest of Emacs. > Perhaps I'll turn it back to t for now and just have that in my bag > of tricks if I encounter a file that has this problem. Yes, that's what I recommend.
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(Wed, 14 Feb 2018 19:56:02 GMT) Full text and rfc822 format available.bug-gnu-emacs <at> gnu.org
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(Thu, 15 Feb 2018 01:50:02 GMT) Full text and rfc822 format available.Message #19 received at 30457 <at> debbugs.gnu.org (full text, mbox):
From: Noam Postavsky <npostavs <at> gmail.com> To: Aaron Jensen <aaronjensen <at> gmail.com> Cc: 30457 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org> Subject: Re: bug#30457: 26.0.91; bidi-display-reordering makes navigation around melpa/archive-contents slow Date: Wed, 14 Feb 2018 20:48:59 -0500
Aaron Jensen <aaronjensen <at> gmail.com> writes: > I didn't know this, I'm not sure what it means in practice. Perhaps > I'll turn it back to t for now and just have that in my bag of tricks > if I encounter a file that has this problem. Another workaround/trick for long-lines in cases where the line in question is a big lisp expression M-: (pp-buffer) RET (but only in Emacs 26; before that lisp indentation is quadratic in the size of the expression, cf Bug#25122)
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(Thu, 15 Feb 2018 03:08:02 GMT) Full text and rfc822 format available.Message #22 received at 30457 <at> debbugs.gnu.org (full text, mbox):
From: Aaron Jensen <aaronjensen <at> gmail.com> To: Noam Postavsky <npostavs <at> gmail.com> Cc: 30457 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org> Subject: Re: bug#30457: 26.0.91; bidi-display-reordering makes navigation around melpa/archive-contents slow Date: Wed, 14 Feb 2018 19:07:29 -0800
On Wed, Feb 14, 2018 at 5:48 PM, Noam Postavsky <npostavs <at> gmail.com> wrote: > Another workaround/trick for long-lines in cases where the line in > question is a big lisp expression > > M-: (pp-buffer) RET > > (but only in Emacs 26; before that lisp indentation is quadratic in the > size of the expression, cf Bug#25122) That's a nice trick, thanks!
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(Thu, 15 Feb 2018 18:50:02 GMT) Full text and rfc822 format available.Message #25 received at 30457 <at> debbugs.gnu.org (full text, mbox):
From: Aaron Jensen <aaronjensen <at> gmail.com> To: Eli Zaretskii <eliz <at> gnu.org> Cc: 30457 <at> debbugs.gnu.org Subject: Re: bug#30457: 26.0.91; bidi-display-reordering makes navigation around melpa/archive-contents slow Date: Thu, 15 Feb 2018 10:49:23 -0800
Recapturing thread that accidentally went private... On Wed, Feb 14, 2018 at 7:37 PM, Eli Zaretskii <eliz <at> gnu.org> wrote: > > So is this bug a WONTFIX then? > It isn't WONTFIX, I just don't know how to make the BPA implementation > faster with such long lines and deeply nested parentheses. It already > includes all the optimizations I could think of. But maybe someone > else will find a way to optimize it more. I'm only just now learning about BPA, so I apologize if this is a silly question, but would it be any faster to scan a buffer and determine that there are no rtl characters so parentheses matching is unnecessary? > > And/or does it fall into the general "emacs is not super optimized > > for long lines" thing? > It does, sort of. At least near the end of the buffer you clearly see > that bidi-display-reordering has a much smaller effect, in relative > terms. Yeah, I wasn't aware that the end of the buffer had more slowness, but that's good to know. Thanks, Aaron
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(Thu, 15 Feb 2018 21:48:02 GMT) Full text and rfc822 format available.Message #28 received at 30457 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Aaron Jensen <aaronjensen <at> gmail.com> Cc: 30457 <at> debbugs.gnu.org Subject: Re: bug#30457: 26.0.91; bidi-display-reordering makes navigation around melpa/archive-contents slow Date: Thu, 15 Feb 2018 23:47:26 +0200
> From: Aaron Jensen <aaronjensen <at> gmail.com> > Date: Thu, 15 Feb 2018 10:49:23 -0800 > Cc: 30457 <at> debbugs.gnu.org > > > It isn't WONTFIX, I just don't know how to make the BPA implementation > > faster with such long lines and deeply nested parentheses. It already > > includes all the optimizations I could think of. But maybe someone > > else will find a way to optimize it more. > > I'm only just now learning about BPA, so I apologize if this is a > silly question, but would it be any faster to scan a buffer and > determine that there are no rtl characters so parentheses matching is > unnecessary? Scanning the entire buffer could be faster only for small buffers. But with a very large buffer we'd be scanning a lot more than needed, because redisplay tries very hard not to examine much more of the buffer than is needed to show one window-full. And due to the way the display engine is designed, it doesn't lend itself easily to caching stuff, so you'd need to scan the entire buffer every redisplay cycle, e.g., after each C-n. The current code in bidi_find_bracket_pairs scans only as much as needed (which unfortunately could be quite a lot for deeply nested parens in a long line). And it already includes an optimization for strictly left-to-right text inside the parens, something that it detects as part of the scan. > > It does, sort of. At least near the end of the buffer you clearly see > > that bidi-display-reordering has a much smaller effect, in relative > > terms. > > Yeah, I wasn't aware that the end of the buffer had more slowness, but > that's good to know. The farther you are from the beginning of line, the more buffer positions Emacs needs to scan to determine where to put point after C-n or C-p. That's because the layout calculations needed for determining coordinates of each buffer position must start from some known anchor, and currently the only anchor is the line beginning, where we sure the X coordinate is zero. So Emacs needs to go back to the line beginning (something it can do very fast), and then come back (much slower) one character at a time, until it hits the buffer position with the right coordinate. That coming back is the main reason why doing this near the end of the line is so much slower than near the beginning.
Eli Zaretskii <eliz <at> gnu.org>
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(Tue, 10 Mar 2020 14:41:02 GMT) Full text and rfc822 format available.Stefan Kangas <stefan <at> marxist.se>
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(Fri, 21 Aug 2020 17:07:02 GMT) Full text and rfc822 format available.Stefan Kangas <stefan <at> marxist.se>
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