GNU bug report logs -
#73046
29.4; Emacs 100% CPU usage for several seconds when opening dired buffer over TRAMP
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Reported by: "Suhail Singh" <suhailsingh247 <at> gmail.com>
Date: Thu, 5 Sep 2024 14:56:01 UTC
Severity: normal
Found in version 29.4
Fixed in version 31.1
Done: Michael Albinus <michael.albinus <at> gmx.de>
Bug is archived. No further changes may be made.
Full log
Message #152 received at 73046 <at> debbugs.gnu.org (full text, mbox):
Eli Zaretskii <eliz <at> gnu.org> writes:
>> 2. If we are in parent directory, and soon after pressing RET we invoke
>> M-x we don't see the minibuffer prompt till after the offending
>> directory has finished font-locking.
>>
>> 3. If after invoking M-x we immediately start typing, the keyboard input
>> is registered, however, it doesn't display in the minibuffer till
>> after the offending directory has finished font-locking.
>> Additionally, doing so invariably results in 100% CPU usage for the
>> duration of the font-locking. Sometimes invoking M-x alone results
>> in CPU usage going back up to 100% (while font-locking is still being
>> done).
>>
>> Thoughts?
>
> Are 2 and 3 new with this patch, or were they present in the previous
> code as well?
Present prior to the patch as well.
> And what do you expect to happen when you press M-x while Emacs is
> still busy performing your previous command?
I did not have any expectations wrt 2. I knew that it was possible that
2 was simply a limitation of the single-threaded reality of the current
implementation. However, it wasn't clear (till now) whether that was
necessarily the case.
I did not expect 3 to happen. I.e., wrt 3 my expectation was that
invoking M-x and typing doesn't result in a noticable increase in CPU
usage for the duration of the font-locking.
> Having the visual response delayed until the previous command finishes
> is normal Emacs behavior, being a single-threaded program which
> executes commands one by one in the same thread.
Understood.
--
Suhail
This bug report was last modified 295 days ago.
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