Package: emacs;
Reported by: alexis purslane <alexispurslane <at> pm.me>
Date: Thu, 5 Jun 2025 01:29:02 UTC
Severity: normal
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bug-gnu-emacs <at> gnu.org:bug#78697; Package emacs.
(Thu, 05 Jun 2025 01:29:03 GMT) Full text and rfc822 format available.alexis purslane <alexispurslane <at> pm.me>:bug-gnu-emacs <at> gnu.org.
(Thu, 05 Jun 2025 01:29:03 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: alexis purslane <alexispurslane <at> pm.me> To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org> Subject: `treesit-major-mode-setup` causing substantial pause when finding a file Date: Thu, 05 Jun 2025 01:27:58 +0000
[Message part 1 (text/plain, inline)]
# Problem
As the title says: `treesit-major-mode-setup` appears to be causing a substantial pause when finding a file that involves tree sitter modes (that I have installed). I'm unclear s to why.
# Detailed Information
## System
Apple Mac Studio M1 Max running macOS 15.5 Sequoia (`aarch64-apple-darwin24.5.0`) (temporarily using it instead of my Linux machine for work reasons)
## Emacs
I've tried a few variations of Emacs to root out the problem:
### emacs-plus <at> 31 from Homebrew
System Configuration Options: `--disable-dependency-tracking --disable-silent-rules --enable-locallisppath=/opt/homebrew/share/emacs/site-lisp --infodir=/opt/homebrew/Cellar/emacs-plus <at> 31/31.0.50/share/info/emacs --prefix=/opt/homebrew/Cellar/emacs-plus <at> 31/31.0.50 --with-native-compilation=aot --with-xml2 --with-gnutls --without-compress-install --without-dbus --without-imagemagick --with-modules --with-rsvg --with-webp --with-ns --disable-ns-self-contained 'CFLAGS=-O2 -DFD_SETSIZE=10000 -DDARWIN_UNLIMITED_SELECT'`
System Configuration Features: `ACL GIF GLIB GMP GNUTLS JPEG LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM ZLIB`
#### Issues:
- Random freezes all the time
- Substantial freezes when opening a file
### `feature/igc` emacs 31.0.50 from HEAD
System Configuration Options: `--prefix=/usr/local --with-tree-sitter --with-xwidgets --with-ns --with-native-compilation=aot --with-imagemagick --without-compress-install --with-small-ja-dic --without-selinux --without-gsettings CC=clang 'CFLAGS=-O3 -march=native`
System Configuration Features: `ACL GLIB GNUTLS IMAGEMAGICK LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM XWIDGETS ZLIB`
#### Issues
- Thanks to the experimental MPS garbage collector, the random intermediate pauses have gone away (although it's still odd they were there – even without MPS my Emacs configuration doesn't pause randomly on Linux)
- However, while shorter, the pauses upon opening a new file are the same.
### same as above but with `treesit-auto` disabled
Profiling the previous two versions seemed to indicate that a function in the `treesit-auto` package was to blame, so I disabled `treesit-auto-mode` to see if that made a difference; it did not. However, it narrowed down the issue further:
#### Issues
- There is no undue pause when opening any other kind of file; only tree-sitter enabled files are so slow.
- Most time opening a file (38%) is spent within `treesit-major-mode-setup`:
```
112,106,431 95% - command-execute
...
84,918,927 72% - find-file
84,916,421 72% - find-file-noselect
84,902,072 72% - find-file-noselect-1
84,852,273 72% - after-find-file
84,735,710 72% - normal-mode
80,077,055 68% - set-auto-mode
79,933,703 68% - set-auto-mode--apply-alist
79,923,463 68% - set-auto-mode-0
79,923,463 68% - clojure-ts-clojurescript-mode
45,382,937 38% - clojure-ts-mode
45,305,561 38% + treesit-major-mode-setup
25,386 0% + treesit-ready-p
20,512 0% + clojure-ts-mode-variables
17,202 0% clojure-ts--ensure-grammars
8,288 0% + clojure-ts--compute-semantic-indentation-rules-cache
34,540,526 29% + run-mode-hooks
...
```
The function `clojure-ts-clojurescript-mode` seems to add significant overhead as well, even though it appears to be a simple derived mode that doesn't even have any body forms. It didn't have any problem on Linux.
I'm rather at a loss as to what's going on.
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bug-gnu-emacs <at> gnu.org:bug#78697; Package emacs.
(Thu, 05 Jun 2025 09:10:04 GMT) Full text and rfc822 format available.Message #8 received at 78697 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: alexis purslane <alexispurslane <at> pm.me> Cc: 78697 <at> debbugs.gnu.org Subject: Re: bug#78697: `treesit-major-mode-setup` causing substantial pause when finding a file Date: Thu, 05 Jun 2025 12:09:00 +0300
> Date: Thu, 05 Jun 2025 01:27:58 +0000 > From: alexis purslane via "Bug reports for GNU Emacs, > the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> > > - Most time opening a file (38%) is spent within `treesit-major-mode-setup`: > > ``` > 112,106,431 95% - command-execute > ... > 84,918,927 72% - find-file > 84,916,421 72% - find-file-noselect > 84,902,072 72% - find-file-noselect-1 > 84,852,273 72% - after-find-file > 84,735,710 72% - normal-mode > 80,077,055 68% - set-auto-mode > 79,933,703 68% - set-auto-mode--apply-alist > 79,923,463 68% - set-auto-mode-0 > 79,923,463 68% - clojure-ts-clojurescript-mode > 45,382,937 38% - clojure-ts-mode > 45,305,561 38% + treesit-major-mode-setup > 25,386 0% + treesit-ready-p > 20,512 0% + clojure-ts-mode-variables > 17,202 0% clojure-ts--ensure-grammars > 8,288 0% + clojure-ts--compute-semantic-indentation-rules-cache > 34,540,526 29% + run-mode-hooks > ... > ``` > > The function `clojure-ts-clojurescript-mode` seems to add significant overhead as well, even though it appears to be a simple derived mode that doesn't even have any body forms. It didn't have any problem on Linux. Please show the fully expanded profile, with all the levels marked with "+" expanded. As posted, the profile stops showing details at the most important function: treesit-major-mode-setup, so it is hard to come up with ideas what could be the problem. Also, since clojure-ts-mode is not part of Emacs, did you report this to the mode's developers? Thanks.
bug-gnu-emacs <at> gnu.org:bug#78697; Package emacs.
(Thu, 05 Jun 2025 13:56:01 GMT) Full text and rfc822 format available.Message #11 received at 78697 <at> debbugs.gnu.org (full text, mbox):
From: alexis purslane <alexispurslane <at> pm.me> To: Eli Zaretskii <eliz <at> gnu.org> Cc: 78697 <at> debbugs.gnu.org Subject: Re: bug#78697: `treesit-major-mode-setup` causing substantial pause when finding a file Date: Thu, 05 Jun 2025 13:55:05 +0000
[Message part 1 (text/plain, inline)]
I don't have the original profile anymore, but it was easy enough to reproduce. Here's that reproduced version:
481 80% - command-execute
481 80% - funcall-interactively
481 80% - god-mode-self-insert
262 44% - funcall-interactively
261 43% - project-find-file
261 43% - project-find-file-in
205 34% - find-file
205 34% - find-file-noselect
202 34% - find-file-noselect-1
200 33% - after-find-file
195 32% - normal-mode
189 31% - set-auto-mode
188 31% - set-auto-mode--apply-alist
188 31% - set-auto-mode-0
188 31% - clojure-ts-clojurescript-mode
164 27% - clojure-ts-mode
114 19% - treesit-major-mode-setup
114 19% - treesit-validate-font-lock-rules
91 15% treesit-query-compile
23 3% clojure-ts--ensure-grammars
10 1% + treesit-ready-p
1 0% + clojure-ts-mode-variables
24 4% + run-mode-hooks
1 0% + hack-dir-local--get-variables
6 1% + font-lock-mode
5 0% + run-hooks
2 0% insert-file-contents
1 0% abbreviate-file-name
1 0% + file-truename
1 0% + find-buffer-visiting
52 8% + project--read-file-name
4 0% + project-files
1 0% + execute-extended-command
122 20% - god-mode-lookup-key-sequence
85 14% - god-mode-lookup-command
85 14% - apply
85 14% - which-key--god-mode-lookup-command-advice
85 14% + #<native-comp-function god-mode-lookup-command>
37 6% + god-key-string-after-consuming-key
97 16% + byte-code
91 15% redisplay_internal (C function)
11 1% + ...
10 1% + timer-event-handler
1 0% + which-key--hide-popup
Also, I didn't original report this to the clojurescript-ts-mode folks because (1) since this branched into built-in functions it seemed like an emacs problem, and compoundingly (2) in one of the earlier iterations of my testing I was seeing this performance issue across all files that would load tree-sitter modes; however, I just did another couple tests and profiles with rust, bash, and TSX and didn't see it anymore, so I'll go poke them about it now because it does seem like more of their problem.
On Thursday, June 5th, 2025 at 9:09 AM, Eli Zaretskii <eliz <at> gnu.org> wrote:
> > Date: Thu, 05 Jun 2025 01:27:58 +0000
> > From: alexis purslane via "Bug reports for GNU Emacs,
> > the Swiss army knife of text editors" bug-gnu-emacs <at> gnu.org
> >
> > - Most time opening a file (38%) is spent within `treesit-major-mode-setup`:
> >
> > `112,106,431 95% - command-execute ... 84,918,927 72% - find-file 84,916,421 72% - find-file-noselect 84,902,072 72% - find-file-noselect-1 84,852,273 72% - after-find-file 84,735,710 72% - normal-mode 80,077,055 68% - set-auto-mode 79,933,703 68% - set-auto-mode--apply-alist 79,923,463 68% - set-auto-mode-0 79,923,463 68% - clojure-ts-clojurescript-mode 45,382,937 38% - clojure-ts-mode 45,305,561 38% + treesit-major-mode-setup 25,386 0% + treesit-ready-p 20,512 0% + clojure-ts-mode-variables 17,202 0% clojure-ts--ensure-grammars 8,288 0% + clojure-ts--compute-semantic-indentation-rules-cache 34,540,526 29% + run-mode-hooks ...`
> >
> > The function `clojure-ts-clojurescript-mode` seems to add significant overhead as well, even though it appears to be a simple derived mode that doesn't even have any body forms. It didn't have any problem on Linux.
>
>
> Please show the fully expanded profile, with all the levels marked
> with "+" expanded. As posted, the profile stops showing details at
> the most important function: treesit-major-mode-setup, so it is hard
> to come up with ideas what could be the problem.
>
> Also, since clojure-ts-mode is not part of Emacs, did you report this
> to the mode's developers?
>
> Thanks.
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bug-gnu-emacs <at> gnu.org:bug#78697; Package emacs.
(Thu, 05 Jun 2025 14:04:02 GMT) Full text and rfc822 format available.Message #14 received at 78697 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: alexis purslane <alexispurslane <at> pm.me> Cc: 78697 <at> debbugs.gnu.org Subject: Re: bug#78697: `treesit-major-mode-setup` causing substantial pause when finding a file Date: Thu, 05 Jun 2025 17:03:10 +0300
> Date: Thu, 05 Jun 2025 13:55:05 +0000 > From: alexis purslane <alexispurslane <at> pm.me> > Cc: 78697 <at> debbugs.gnu.org > > I don't have the original profile anymore, but it was easy enough to reproduce. Here's that reproduced version: > > 481 80% - command-execute > 481 80% - funcall-interactively > 481 80% - god-mode-self-insert > 262 44% - funcall-interactively > 261 43% - project-find-file > 261 43% - project-find-file-in > 205 34% - find-file > 205 34% - find-file-noselect > 202 34% - find-file-noselect-1 > 200 33% - after-find-file > 195 32% - normal-mode > 189 31% - set-auto-mode > 188 31% - set-auto-mode--apply-alist > 188 31% - set-auto-mode-0 > 188 31% - clojure-ts-clojurescript-mode > 164 27% - clojure-ts-mode > 114 19% - treesit-major-mode-setup > 114 19% - treesit-validate-font-lock-rules > 91 15% treesit-query-compile > 23 3% clojure-ts--ensure-grammars > 10 1% + treesit-ready-p > 1 0% + clojure-ts-mode-variables > 24 4% + run-mode-hooks > 1 0% + hack-dir-local--get-variables > 6 1% + font-lock-mode > 5 0% + run-hooks > 2 0% insert-file-contents > 1 0% abbreviate-file-name > 1 0% + file-truename > 1 0% + find-buffer-visiting > 52 8% + project--read-file-name > 4 0% + project-files > 1 0% + execute-extended-command > 122 20% - god-mode-lookup-key-sequence > 85 14% - god-mode-lookup-command > 85 14% - apply > 85 14% - which-key--god-mode-lookup-command-advice > 85 14% + #<native-comp-function god-mode-lookup-command> > 37 6% + god-key-string-after-consuming-key > 97 16% + byte-code > 91 15% redisplay_internal (C function) > 11 1% + ... > 10 1% + timer-event-handler > 1 0% + which-key--hide-popup Thanks, this seem to say that a large portion of time is spent inside treesit-query-compile. > Also, I didn't original report this to the clojurescript-ts-mode folks because (1) since this branched into built-in functions it seemed like an emacs problem, and compoundingly (2) in one of the earlier iterations of my testing I was seeing this performance issue across all files that would load tree-sitter modes; however, I just did another couple tests and profiles with rust, bash, and TSX and didn't see it anymore, so I'll go poke them about it now because it does seem like more of their problem. It is quite possible that clojure-ts-clojurescript-mode defines some mode-specific data that makes treesit-query-compile do some heavy lifting. So I think you should report this to the mode developers.
bug-gnu-emacs <at> gnu.org:bug#78697; Package emacs.
(Thu, 05 Jun 2025 14:06:02 GMT) Full text and rfc822 format available.Message #17 received at 78697 <at> debbugs.gnu.org (full text, mbox):
From: alexis purslane <alexispurslane <at> pm.me> To: Eli Zaretskii <eliz <at> gnu.org> Cc: 78697 <at> debbugs.gnu.org Subject: Re: bug#78697: `treesit-major-mode-setup` causing substantial pause when finding a file Date: Thu, 05 Jun 2025 14:04:56 +0000
[Message part 1 (text/plain, inline)]
Yeah, looking at the new profiles made me realize that too, so I submitted it before responding. In case you want to follow the issue: https://github.com/clojure-emacs/clojure-ts-mode/issues/109 On Thursday, June 5th, 2025 at 2:03 PM, Eli Zaretskii <eliz <at> gnu.org> wrote: > > Date: Thu, 05 Jun 2025 13:55:05 +0000 > > From: alexis purslane alexispurslane <at> pm.me > > Cc: 78697 <at> debbugs.gnu.org > > > > I don't have the original profile anymore, but it was easy enough to reproduce. Here's that reproduced version: > > > > 481 80% - command-execute > > 481 80% - funcall-interactively > > 481 80% - god-mode-self-insert > > 262 44% - funcall-interactively > > 261 43% - project-find-file > > 261 43% - project-find-file-in > > 205 34% - find-file > > 205 34% - find-file-noselect > > 202 34% - find-file-noselect-1 > > 200 33% - after-find-file > > 195 32% - normal-mode > > 189 31% - set-auto-mode > > 188 31% - set-auto-mode--apply-alist > > 188 31% - set-auto-mode-0 > > 188 31% - clojure-ts-clojurescript-mode > > 164 27% - clojure-ts-mode > > 114 19% - treesit-major-mode-setup > > 114 19% - treesit-validate-font-lock-rules > > 91 15% treesit-query-compile > > 23 3% clojure-ts--ensure-grammars > > 10 1% + treesit-ready-p > > 1 0% + clojure-ts-mode-variables > > 24 4% + run-mode-hooks > > 1 0% + hack-dir-local--get-variables > > 6 1% + font-lock-mode > > 5 0% + run-hooks > > 2 0% insert-file-contents > > 1 0% abbreviate-file-name > > 1 0% + file-truename > > 1 0% + find-buffer-visiting > > 52 8% + project--read-file-name > > 4 0% + project-files > > 1 0% + execute-extended-command > > 122 20% - god-mode-lookup-key-sequence > > 85 14% - god-mode-lookup-command > > 85 14% - apply > > 85 14% - which-key--god-mode-lookup-command-advice > > 85 14% + #<native-comp-function god-mode-lookup-command> > > 37 6% + god-key-string-after-consuming-key > > 97 16% + byte-code > > 91 15% redisplay_internal (C function) > > 11 1% + ... > > 10 1% + timer-event-handler > > 1 0% + which-key--hide-popup > > > Thanks, this seem to say that a large portion of time is spent inside > treesit-query-compile. > > > Also, I didn't original report this to the clojurescript-ts-mode folks because (1) since this branched into built-in functions it seemed like an emacs problem, and compoundingly (2) in one of the earlier iterations of my testing I was seeing this performance issue across all files that would load tree-sitter modes; however, I just did another couple tests and profiles with rust, bash, and TSX and didn't see it anymore, so I'll go poke them about it now because it does seem like more of their problem. > > > It is quite possible that clojure-ts-clojurescript-mode defines some > mode-specific data that makes treesit-query-compile do some heavy > lifting. So I think you should report this to the mode developers.
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bug-gnu-emacs <at> gnu.org:bug#78697; Package emacs.
(Thu, 05 Jun 2025 15:03:06 GMT) Full text and rfc822 format available.Message #20 received at 78697 <at> debbugs.gnu.org (full text, mbox):
From: alexis purslane <alexispurslane <at> pm.me> To: Eli Zaretskii <eliz <at> gnu.org> Cc: 78697 <at> debbugs.gnu.org Subject: Re: bug#78697: `treesit-major-mode-setup` causing substantial pause when finding a file Date: Thu, 05 Jun 2025 15:01:48 +0000
[Message part 1 (text/plain, inline)]
Oh, I did want to mention that while on Linux I didn't notice much of an improvement using MPS, on Mac OS, going from regular Emacs to the feature/igc branch eliminated a huge amount of very long and constant random pauses and made it much, much faster. And I haven't run into any bugs or issues with it still. On Thursday, June 5th, 2025 at 2:04 PM, alexis purslane <alexispurslane <at> pm.me> wrote: > Yeah, looking at the new profiles made me realize that too, so I submitted it before responding. In case you want to follow the issue: https://github.com/clojure-emacs/clojure-ts-mode/issues/109 > > On Thursday, June 5th, 2025 at 2:03 PM, Eli Zaretskii eliz <at> gnu.org wrote: > > > > Date: Thu, 05 Jun 2025 13:55:05 +0000 > > > From: alexis purslane alexispurslane <at> pm.me > > > Cc: 78697 <at> debbugs.gnu.org > > > > > > I don't have the original profile anymore, but it was easy enough to reproduce. Here's that reproduced version: > > > > > > 481 80% - command-execute > > > 481 80% - funcall-interactively > > > 481 80% - god-mode-self-insert > > > 262 44% - funcall-interactively > > > 261 43% - project-find-file > > > 261 43% - project-find-file-in > > > 205 34% - find-file > > > 205 34% - find-file-noselect > > > 202 34% - find-file-noselect-1 > > > 200 33% - after-find-file > > > 195 32% - normal-mode > > > 189 31% - set-auto-mode > > > 188 31% - set-auto-mode--apply-alist > > > 188 31% - set-auto-mode-0 > > > 188 31% - clojure-ts-clojurescript-mode > > > 164 27% - clojure-ts-mode > > > 114 19% - treesit-major-mode-setup > > > 114 19% - treesit-validate-font-lock-rules > > > 91 15% treesit-query-compile > > > 23 3% clojure-ts--ensure-grammars > > > 10 1% + treesit-ready-p > > > 1 0% + clojure-ts-mode-variables > > > 24 4% + run-mode-hooks > > > 1 0% + hack-dir-local--get-variables > > > 6 1% + font-lock-mode > > > 5 0% + run-hooks > > > 2 0% insert-file-contents > > > 1 0% abbreviate-file-name > > > 1 0% + file-truename > > > 1 0% + find-buffer-visiting > > > 52 8% + project--read-file-name > > > 4 0% + project-files > > > 1 0% + execute-extended-command > > > 122 20% - god-mode-lookup-key-sequence > > > 85 14% - god-mode-lookup-command > > > 85 14% - apply > > > 85 14% - which-key--god-mode-lookup-command-advice > > > 85 14% + #<native-comp-function god-mode-lookup-command> > > > 37 6% + god-key-string-after-consuming-key > > > 97 16% + byte-code > > > 91 15% redisplay_internal (C function) > > > 11 1% + ... > > > 10 1% + timer-event-handler > > > 1 0% + which-key--hide-popup > > > > Thanks, this seem to say that a large portion of time is spent inside > > treesit-query-compile. > > > > > Also, I didn't original report this to the clojurescript-ts-mode folks because (1) since this branched into built-in functions it seemed like an emacs problem, and compoundingly (2) in one of the earlier iterations of my testing I was seeing this performance issue across all files that would load tree-sitter modes; however, I just did another couple tests and profiles with rust, bash, and TSX and didn't see it anymore, so I'll go poke them about it now because it does seem like more of their problem. > > > > It is quite possible that clojure-ts-clojurescript-mode defines some > > mode-specific data that makes treesit-query-compile do some heavy > > lifting. So I think you should report this to the mode developers.
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