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Subject: bug#61942: 28.2; uninterruptible hang in vc-diff buffer
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From *vc-outgoing*, I used '=' to see a diff.
The diff in question is pretty large.
Emacs showed this in the echo area:
Finding changes in ....
This was not interruptible -- I tried C-g, C-], and 'kill -USR1'
I don't know exactly what this is doing, but whatever it is should be
interruptible.
Tom
In GNU Emacs 28.2 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.24.35, cairo version 1.17.6)
of 2022-12-31 built on buildvm-x86-18.iad2.fedoraproject.org
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Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Tom Tromey <tom@HIDDEN> Subject: bug#61942: Acknowledgement (28.2; uninterruptible hang in vc-diff buffer) Message-ID: <handler.61942.B.16778672367359.ack <at> debbugs.gnu.org> References: <87y1od8zzs.fsf@HIDDEN> X-Gnu-PR-Message: ack 61942 X-Gnu-PR-Package: emacs Reply-To: 61942 <at> debbugs.gnu.org Date: Fri, 03 Mar 2023 18:14:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 61942 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 61942: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D61942 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#61942: 28.2; uninterruptible hang in vc-diff buffer
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Hi!
Late reply here.
On 03/03/2023 20:13, Tom Tromey wrote:
> From*vc-outgoing*, I used '=' to see a diff.
>
> The diff in question is pretty large.
>
> Emacs showed this in the echo area:
>
> Finding changes in ....
>
> This was not interruptible -- I tried C-g, C-], and 'kill -USR1'
>
> I don't know exactly what this is doing, but whatever it is should be
> interruptible.
I've been doing some performance debugging for vc-diff, and the same
thing has happened once when c-ts-mode was associated with *.c files.
That time I also turned off the cache for diff's revision syntax
highlighting and repeated a 'vc-diff' for one revision several times.
Profiling this scenario gets me to
7940 85% - diff--get-revision-properties
7940 85% - let*
5637 61% - if
5637 61% - condition-case
5637 61% - vc-find-revision-no-save
5622 60% - decode-coding-inserted-region
3 0% - set-auto-coding
3 0% - find-auto-coding
3 0% + set-auto-mode-1
12 0% + set-auto-mode
3 0% + vc-call-backend
and if we're talking about tree-sitter based modes, it might be due to
memory usage (or not).
Anyway, if you're seeing this regularly
(setq diff-font-lock-syntax 'hunk-only)
should help as a workaround.
X-Loop: help-debbugs@HIDDEN
Subject: bug#61942: 28.2; uninterruptible hang in vc-diff buffer
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Hello Dmitry, Tom,
Do we have a reproducer for this? Otherwise, I'd like to suggest
closing the report for now.
--
Sean Whitton
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Subject: bug#61942: 28.2; uninterruptible hang in vc-diff buffer
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> Do we have a reproducer for this? Otherwise, I'd like to suggest
> closing the report for now.
I encounter this quite a bit -- several times a week.
All it really seems to take is paging through a diff with some very
large hunks.
I tried finding a reproducer on one of my current branches but couldn't.
Anyway, closing this is premature since there is still a bug here.
Tom
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Subject: bug#61942: 28.2; uninterruptible hang in vc-diff buffer
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On 11/03/2025 13:29, Sean Whitton wrote:
> Hello Dmitry, Tom,
>
> Do we have a reproducer for this? Otherwise, I'd like to suggest
> closing the report for now.
The reproducer for the scenario I have in mind is opening a diff, for
the first time in a session, that references one of the larger .c files.
For example, from the current Emacs master, launch 'C-x v L' (root log),
and from there move to
* ab5bfcebddf..: Po Lu 2025-03-10 Fix bug#76805
and press 'd'. The first time I do it, in a session, takes about 600ms.
Quitting or killing the diff buffer and repeating the action makes it
instant because the file buffer stays in diff--cached-revision-buffers,
for some time.
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Subject: bug#61942: 28.2; uninterruptible hang in vc-diff buffer
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On 13/03/2025 22:22, Tom Tromey wrote:
> All it really seems to take is paging through a diff with some very
> large hunks.
If the repro requires really large hunks, it might be due to the
"refine" feature, which can be relatively costly.
When you see the problem again, maybe try (setq diff-refine nil).
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Hello,
On Fri 14 Mar 2025 at 02:24am +02, Dmitry Gutov wrote:
> On 11/03/2025 13:29, Sean Whitton wrote:
>> Hello Dmitry, Tom,
>> Do we have a reproducer for this? Otherwise, I'd like to suggest
>> closing the report for now.
>
> The reproducer for the scenario I have in mind is opening a diff, for the
> first time in a session, that references one of the larger .c files.
>
> For example, from the current Emacs master, launch 'C-x v L' (root log), and
> from there move to
>
> * ab5bfcebddf..: Po Lu 2025-03-10 Fix bug#76805
>
> and press 'd'. The first time I do it, in a session, takes about 600ms.
>
> Quitting or killing the diff buffer and repeating the action makes it instant
> because the file buffer stays in diff--cached-revision-buffers, for some time.
Thank you both for your replies.
Dmitry, regarding your reproducer, on my laptop (bought late 2020)
I can't discern a difference before or after the caching.
Tom, it would be great if you could try Dmitry's suggestion and see if
it makes a difference.
--
Sean Whitton
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Subject: bug#61942: 28.2; uninterruptible hang in vc-diff buffer
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> Cc: Dmitry Gutov <dmitry@HIDDEN>, Tom Tromey <tom@HIDDEN>,
> 61942 <at> debbugs.gnu.org
> From: Tom Tromey <tom@HIDDEN>
> Date: Thu, 13 Mar 2025 14:22:46 -0600
>
> > Do we have a reproducer for this? Otherwise, I'd like to suggest
> > closing the report for now.
>
> I encounter this quite a bit -- several times a week.
>
> All it really seems to take is paging through a diff with some very
> large hunks.
>
> I tried finding a reproducer on one of my current branches but couldn't.
>
> Anyway, closing this is premature since there is still a bug here.
There's no reason to keep a bug open if no one is working on it and we
don't have way of reproducing it to enable such work.
So please try to show a recipe for reproducing the problem, even if
the recipe is not 100% reliable. Doing so will go a long way towards
ensuring we do identify and solve the bug.
Thanks.
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