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bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacO
From: |
Eli Zaretskii |
Subject: |
bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS) |
Date: |
Tue, 15 Jul 2025 16:30:23 +0300 |
> From: Przemysław Alexander Kamiński
> <przemyslaw@kaminski.se>
> Cc: 79023@debbugs.gnu.org
> Date: Tue, 15 Jul 2025 15:01:55 +0200
>
> On 15 Jul 2025, at 14:23, Eli Zaretskii wrote:
>
> Given the above description, why did you decide the leak is in
> redisplay_internal?
>
> 39,652,925 72% - redisplay_internal (C function)
> 1,797,080 3% + eval
> 279,056 0% + jit-lock-function
> 66,632 0% + which-key--hide-popup-on-frame-size-change
> 24,752 0% mode-line-default-help-echo
> 11,328 0% + menu-bar-update-buffers
>
> This is taken from just now. It seems like a lot of memory goes there. Given
> that I have 2Gbs of usage
> beyond ~40mb reporting I'd suspect something fishy is happening there.
This is not relevant. The so-called "memory profiler" doesn't
profile memory usage, it just uses calls to memory-allocation
functions as an opportunity to profile Emacs. So what your profile
says is that redisplay_internal was used a lot, but not that there's a
memory leak in it.
> FWIW, I'm using Emacs 30.1.90 all the time, with sessions that last
> several weeks, and its memory footprint, after leveling at several
> hundred MB never grows more, certainly not at the rate you describe.
> So either this is a macOS-specific problem, or something else is at
> work here (perhaps one of the many packages you have activated?).
>
> I'm quite sure that this is the problem with MacOS/NS implementation.
Then let's hear from other macOS users: does anyone else who uses
Emacs on macOS have similar experience wrt the Emacs memory footprint?
In any case, almost all of the code in redisplay_internal is not macOS
specific, so if there's a memory leak there, it is unlikely to affect
only the macOS build of Emacs.
> 1,561,924 54% + timer-event-handler
> 1,185,948 41% - redisplay_internal (C function)
> 287,011 10% + jit-lock-function
> 79,104 2% file-remote-p
> 13,312 0% + kill-this-buffer-enabled-p
> 8,184 0% mode-line-default-help-echo
>
> Usage is 230MiB of memory, reported 5MiB. leaks app (MacOS malloc leak
> tracer) reports barely 229kb of
> leaked memory and it reports 37MiB malloced out of 139MiB (usage dropped
> while I was writing this e-mail).
> Finally - redisplay_internal is the only place I saw memory going out (and
> just noticed that redisplay itself is
> good enough to start GC every couple seconds - 17GCs over 10s test period
> using -Q instance).
See above: your interpretation of the "memory profile" is wrong. In
particular, this profile cannot tell us whether we allocate more
memory than we free.
> And finally, what version of Emacs are you using and how did you build
> it? Is that Emacs 30.1.90 pretest built from the pretest tarball, or
> is it something else?
>
> MacOS built with emacs-plus - built through Homebrew from emacs-30 branch
> right now, but I've seen this
> performance degredation over time on emacs-mac and emacs through MacPorts.
Thanks.
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Przemysław Alexander Kamiński, 2025/07/15
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Eli Zaretskii, 2025/07/15
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Przemysław Alexander Kamiński, 2025/07/15
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS),
Eli Zaretskii <=
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Przemysław Alexander Kamiński, 2025/07/15
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Przemysław Alexander Kamiński, 2025/07/16
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Eli Zaretskii, 2025/07/16
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Przemysław Alexander Kamiński, 2025/07/16
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Eli Zaretskii, 2025/07/16
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Przemysław Alexander Kamiński, 2025/07/16
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Eli Zaretskii, 2025/07/16
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Przemysław Alexander Kamiński, 2025/07/16
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Alan Third, 2025/07/16
- bug#79023: 30.1.90; Suspicion of memory leak on internal_redisplay (MacOS), Przemysław Alexander Kamiński, 2025/07/16