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Subject: bug#76609: 31.0.50; The 0.1s repeat timer is very CPU-intensive; it might be a bug?
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Hello,

I a 0.1 s repeat timer in emacs -Q, then Emacs's the cpu usage is 30% ~
70%.
I think it's a bug.

You can reproduce it by:

(defun exec/emacs-lisp-machine-update()
  ;; do nothing
)
(progn
  (defvar exec/emacs-lisp-machine-timer nil)
  (when (timerp exec/emacs-lisp-machine-timer)
  (cancel-timer exec/emacs-lisp-machine-timer))
  (setq exec/emacs-lisp-machine-timer
  (run-with-timer 0.0 0.1 'exec/emacs-lisp-machine-update))
)


Then you will notice, the Emacs's cpu usage is 30% ~ 70, or you can
chang 0.1 to 0.05, 0.01 to feel the high cpu usage.

Eval Exec



In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.43, cairo version 1.18.2) of 2025-02-27 built on Mufasa
Repository revision: 5815bd52279fdedc752f9f92ace86f8243fbd604
Repository branch: master
System Description: NixOS 24.11 (Vicuna)

Configured using:
 'configure 'CFLAGS=-O3 -march=native'
 CPPFLAGS=-I/home/exec/soft/mps_artifacts_O3
 LDFLAGS=-I/home/exec/soft/mps_artifacts_O3
 --prefix=/home/exec/Projects/git.savannah.gnu.org/git/emacs-build/master-5815bd52279fdedc752f9f92ace86f8243fbd604-O3
 --with-imagemagick --with-mps=yes --with-modules --with-pgtk
 --with-cairo --with-cairo-xcb --without-compress-install
 --with-mailutils --with-tree-sitter --with-xinput2
 --with-native-compilation=aot --enable-link-time-optimization
 --with-file-notification=inotify'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG LCMS2 LIBOTF LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB

Important settings:
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Major mode: ELisp/l

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Load-path shadows:
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/home/exec/.emacs.d/elpaca/builds/modus-themes/theme-loaddefs hides /home/exec/.emacs.d/elpaca/builds/standard-themes/theme-loaddefs
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/home/exec/.emacs.d/elpaca/builds/transient/transient hides /home/exec/Projects/git.savannah.gnu.org/git/emacs-build/master-5815bd52279fdedc752f9f92ace86f8243fbd604-O3/share/emacs/31.0.50/lisp/transient

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Memory information:
((conses 16 3621582 18472292) (symbols 48 157613 5456)
  (strings 32 893710 403795) (string-bytes 1 27370804) (vectors 16 260241)
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  (intervals 56 73808 42187) (buffers 992 149))

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To: Eval Exec <execvy@HIDDEN>
Subject: bug#76609: Acknowledgement (31.0.50; The 0.1s repeat timer is
 very CPU-intensive; it might be a bug?)
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Subject: bug#76609: 31.0.50; The 0.1s repeat timer is very CPU-intensive;  it might be a bug?
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <87h64flcf7.fsf@HIDDEN> (message from Eval Exec on Thu, 27 Feb
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> From: Eval Exec <execvy@HIDDEN>
> Date: Thu, 27 Feb 2025 21:55:40 +0800
> 
> I a 0.1 s repeat timer in emacs -Q, then Emacs's the cpu usage is 30% ~
> 70%.
> I think it's a bug.

I get around 45% with this, but why do you consider this a bug?  Your
timer function perhaps does nothing, but the timer machinery is
invoked every 100 msec, and it does consume CPU.

in addition, when you have a high-frequency timer, the Emacs idle loop
is much more expensive, because instead of waiting inside pselect, it
runs all the loop code every 100 msec.

Maybe I'm missing something, but I don't see a bug here.

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Subject: bug#76609: 31.0.50; The 0.1s repeat timer is very CPU-intensive;  it might be a bug?
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45% CPU for a 0.1s repeating timer does seem surprisingly high. Is
there a way we can optimize this, given the frequent timer
invocations?

On Thu, Feb 27, 2025 at 10:27=E2=80=AFPM Eli Zaretskii <eliz@HIDDEN> wrote=
:
>
> > From: Eval Exec <execvy@HIDDEN>
> > Date: Thu, 27 Feb 2025 21:55:40 +0800
> >
> > I a 0.1 s repeat timer in emacs -Q, then Emacs's the cpu usage is 30% ~
> > 70%.
> > I think it's a bug.
>
> I get around 45% with this, but why do you consider this a bug?  Your
> timer function perhaps does nothing, but the timer machinery is
> invoked every 100 msec, and it does consume CPU.
>
> in addition, when you have a high-frequency timer, the Emacs idle loop
> is much more expensive, because instead of waiting inside pselect, it
> runs all the loop code every 100 msec.
>
> Maybe I'm missing something, but I don't see a bug here.

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From: Eval Exec <execvy@HIDDEN>
Date: Thu, 27 Feb 2025 22:38:35 +0800
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Compare to a bash script:
while true; do
  sleep 0.1;
   date
done

above script have 0% CPU usage on my laptop.

change it to 0.0001:
while true; do
  sleep 0.0001;
   date
done

even 0.0001 s repeat, the bash script only have 4% cpu usage.

So I think a 0.1s repeat timer in Emacs consume 45% is very surprise.
I think maybe we should improve the timer performance

On Thu, Feb 27, 2025 at 10:34=E2=80=AFPM Eval Exec <execvy@HIDDEN> wrote=
:
>
> 45% CPU for a 0.1s repeating timer does seem surprisingly high. Is
> there a way we can optimize this, given the frequent timer
> invocations?
>
> On Thu, Feb 27, 2025 at 10:27=E2=80=AFPM Eli Zaretskii <eliz@HIDDEN> wro=
te:
> >
> > > From: Eval Exec <execvy@HIDDEN>
> > > Date: Thu, 27 Feb 2025 21:55:40 +0800
> > >
> > > I a 0.1 s repeat timer in emacs -Q, then Emacs's the cpu usage is 30%=
 ~
> > > 70%.
> > > I think it's a bug.
> >
> > I get around 45% with this, but why do you consider this a bug?  Your
> > timer function perhaps does nothing, but the timer machinery is
> > invoked every 100 msec, and it does consume CPU.
> >
> > in addition, when you have a high-frequency timer, the Emacs idle loop
> > is much more expensive, because instead of waiting inside pselect, it
> > runs all the loop code every 100 msec.
> >
> > Maybe I'm missing something, but I don't see a bug here.

Last modified: Thu, 27 Feb 2025 14:45:03 UTC

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