GNU bug report logs - #38644
26.3; emacs uses 100% CPU with auto-revert-mode

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Peter Ludemann <peter.ludemann <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Mon, 16 Dec 2019 17:23:30 -0800

[Message part 1 (text/plain, inline)]

This problem occurs with emacs 26.3 but didn't occur with 25.x.
Possibly related to bug#33194.

My hypothesis is that emacs is monitoring some files that it shouldn't
but I need some help in figuring out which files are being monitored and
whether that is indeed a bug.

When I run a CPU-bound job that also does quite a bit of I/O, emacs
becomes very unresponsive -- running "top", I see CPU usage for emacs go
into the 50-100% range.
(Ubuntu 18.04, emacs 26.3 on a 4-CPU machine with SSD disk)

The job I'm running is
    parallel -v --will-cite --keep-order --group -L80 -j8
(the problem does not go away when I change to "-j3")

As far as I know, I don't have any of the output files or directories
open (I have global-auto-revert-mode set) -- all the outputs go into one
directory and when I search the Buffer List, I don't see that
directory.

I upgraded from emacs 25.3 to 26.3 today, with the same .emacs.desktop,
and the problem wasn't showing with emacs 25.3.

I double-checked the output of lsof on one of the running CPU processes
and again couldn't find anything that matched with the Emacs
buffer. However, I did notice that file-name-history did match some.

Any suggestions on how to track down what's causing the polling?  As I
mentioned, this didn't happen with emacs 25.3 with the same files
open. It also doesn't happen when I start 26.3 without the
.emacs.desktop (that is, with nothing in the Buffer List).


"strace -c" emacs when not running the CPU/IO job:
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 31.63    0.009027           3      2950      2534 recvmsg
 23.19    0.006618           3      2057           poll
 13.38    0.003819           3      1100           rt_sigprocmask
 12.10    0.003454          17       209           pselect6
  9.17    0.002618           6       466           writev
  7.62    0.002174           5       405           rt_sigreturn
  1.21    0.000344          57         6           openat
  0.37    0.000105           4        30         1 read
  0.31    0.000089           3        26           timerfd_settime
  0.28    0.000080          11         7           ioctl
  0.22    0.000064          64         1           vfork
  0.11    0.000032          11         3           fcntl
  0.11    0.000030           4         8           close
  0.09    0.000026           1        51         9 stat
  0.06    0.000017          17         1           pipe2
  0.06    0.000016           0        48        11 faccessat
  0.04    0.000011          11         1           getuid
  0.03    0.000009           5         2           wait4
  0.01    0.000003           1         4           write
  0.00    0.000000           0         3           fstat
  0.00    0.000000           0         3           lseek
  0.00    0.000000           0         1           inotify_add_watch
  0.00    0.000000           0         1         1 readlinkat
------ ----------- ----------- --------- --------- ----------------
100.00    0.028536                  7383      2556 total

"strace -c" emacs when running the CPU/IO job:
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 30.79    0.013978           1     15384           poll
 21.05    0.009554           1     15799     12395 recvmsg
 19.44    0.008827           1      6538           writev
 13.96    0.006339           1     12446           rt_sigprocmask
  6.97    0.003162           2      1554           pselect6
  2.96    0.001342           0      3108           rt_sigreturn
  2.95    0.001338           1      1551           read
  1.88    0.000855           1      1551           ioctl
  0.00    0.000000           0        10           stat
  0.00    0.000000           0         1           restart_syscall
  0.00    0.000000           0        10           faccessat
------ ----------- ----------- --------- --------- ----------------
100.00    0.045395                 57952     12395 total

"strace -c emacs when running the CPU/IO job without
global-auto-revert-mode:

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 37.41    0.001833           1      1860      1576 recvmsg
 27.88    0.001366           1      1619           poll
 14.78    0.000724           5       142           pselect6
  7.43    0.000364           2       201           writev
  6.29    0.000308           1       570           rt_sigprocmask
  6.06    0.000297           1       318        24 rt_sigreturn
  0.08    0.000004           1         6           write
  0.06    0.000003           0         8           read
  0.02    0.000001           1         2           openat
  0.00    0.000000           0         2           close
  0.00    0.000000           0         6         3 recvfrom
  0.00    0.000000           0         1         1 faccessat
------ ----------- ----------- --------- --------- ----------------
100.00    0.004900                  4735      1604 total



In GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2019-09-16 built on lcy01-amd64-030
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.3 LTS

Recent messages:
Making completion list...
Saving file /tmp/t10.kythe.json-decoded...
Wrote /tmp/t10.kythe.json-decoded
Quit [5 times]
command-execute: Buffer is read-only: #<buffer *Help*>
Mark set
Quit
Mark saved where search started
Quit [2 times]
Mark saved where search started [2 times]
Quit [4 times]
Configured using:
 'configure --build=x86_64-linux-gnu --prefix=/usr
 '--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
 '--infodir=${prefix}/share/info' --sysconfdir=/etc --localstatedir=/var
 --disable-silent-rules '--libdir=${prefix}/lib/x86_64-linux-gnu'
 '--libexecdir=${prefix}/lib/x86_64-linux-gnu' --disable-maintainer-mode
 --disable-dependency-tracking --prefix=/usr --sharedstatedir=/var/lib
 --program-suffix=26 --with-modules --with-file-notification=inotify
 --with-mailutils --with-x=yes --with-x-toolkit=gtk3 --with-xwidgets
 --with-lcms2 'CFLAGS=-g -O2
 -fdebug-prefix-map=/build/emacs26-TP6iDo/emacs26-26.3~1.git96dd019=.
-fstack-protector-strong
 -Wformat -Werror=format-security -no-pie' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro
 -no-pie''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB
NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD LCMS2

Important settings:
  value of $LC_MONETARY: en_CA.UTF-8
  value of $LC_NUMERIC: en_CA.UTF-8
  value of $LC_TIME: en_CA.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: GNUmakefile

Minor modes in effect:
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  global-auto-revert-mode: t
  show-paren-mode: t
  display-time-mode: t
  savehist-mode: t
  desktop-save-mode: t
  cl-old-struct-compat-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/usr/share/emacs/site-lisp/llvm-6.0/llvm-mode hides
/usr/share/emacs/site-lisp/llvm-7/llvm-mode
/usr/share/emacs/site-lisp/llvm-6.0/emacs hides
/usr/share/emacs/site-lisp/llvm-7/emacs
/usr/share/emacs/site-lisp/llvm-6.0/tablegen-mode hides
/usr/share/emacs/site-lisp/llvm-7/tablegen-mode
/home/peter/.emacs.d/elpa/go-mode-1.5.0/go-mode hides
/usr/share/emacs/site-lisp/elpa-src/go-mode-1.5.0/go-mode
/home/peter/.emacs.d/elpa/go-mode-1.5.0/go-mode-autoloads hides
/usr/share/emacs/site-lisp/elpa-src/go-mode-1.5.0/go-mode-autoloads
/home/peter/.emacs.d/elpa/go-mode-1.5.0/go-mode-pkg hides
/usr/share/emacs/site-lisp/elpa-src/go-mode-1.5.0/go-mode-pkg
/usr/share/emacs/site-lisp/dictionaries-common/flyspell hides
/usr/share/emacs/26.3/lisp/textmodes/flyspell
/usr/share/emacs/site-lisp/dictionaries-common/ispell hides
/usr/share/emacs/26.3/lisp/textmodes/ispell
/usr/share/emacs/site-lisp/rst hides
/usr/share/emacs/26.3/lisp/textmodes/rst
~/emacs/prolog hides /usr/share/emacs/26.3/lisp/progmodes/prolog
/usr/share/emacs/site-lisp/latex-cjk-thai/thai-word hides
/usr/share/emacs/26.3/lisp/language/thai-word

Features:
(shadow mail-extr emacsbug sendmail eieio-opt speedbar sb-image ezimage
dframe find-func completion help-fns tabify man novice pulse misearch
multi-isearch solarized dash quail inf-haskell haskell-decl-scan haskell
haskell-completions haskell-load haskell-commands highlight-uses-mode
haskell-modules haskell-sandbox haskell-repl haskell-debug
haskell-interactive-mode haskell-presentation-mode haskell-collapse
haskell-navigate-imports haskell-compile haskell-process haskell-session
haskell-hoogle edmacro kmacro sort autoload radix-tree cl-extra lisp-mnt
help-mode mm-archive network-stream starttls url-http tls gnutls url-gw
nsm url-cache url-auth vc vc-dispatcher server erlang tempo cl perl-mode
asm-mode conf-mode jka-compr add-log rst haskell-mode haskell-cabal
haskell-utils haskell-font-lock haskell-indentation haskell-string
haskell-sort-imports haskell-lexeme rx haskell-align-imports
haskell-compat haskell-complete-module haskell-ghc-support flymake-proc
flymake warnings dabbrev haskell-customize go-mode url url-proxy
url-privacy url-expand url-methods url-history url-cookie url-domsuf
url-util mailcap find-file ffap etags xref project sh-script executable
tar-mode markdown-mode noutline outline message rmc puny rfc822 mml
mml-sec epa derived epg gnus-util rmail rmail-loaddefs mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr mailabbrev mail-utils gmm-utils mailheader
elec-pair mhtml-mode css-mode smie color dired dired-loaddefs make-mode
python tramp-sh tramp tramp-compat tramp-loaddefs trampver ucs-normalize
parse-time format-spec smerge-mode prolog align shell pcomplete vc-git
diff-mode easy-mmode js advice sgml-mode dom json map imenu thingatpt
cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine
cc-vars cc-defs finder-inf info package easymenu epg-config url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache url-vars seq byte-opt gv bytecomp byte-compile cconv
autorevert filenotify grep compile comint ansi-color ring cus-start
cus-load time-date paren time savehist desktop frameset cl-loaddefs
cl-lib mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
xwidget-internal move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 791439 152674)
 (symbols 48 44537 1)
 (miscs 40 2000 2396)
 (strings 32 134121 30613)
 (string-bytes 1 6691533)
 (vectors 16 70253)
 (vector-slots 8 1997947 168512)
 (floats 8 365 431)
 (intervals 56 50166 2906)
 (buffers 992 501))

[Message part 2 (text/html, inline)]

Message #8 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Peter Ludemann <peter.ludemann <at> gmail.com>
Cc: 38644 <at> debbugs.gnu.org
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Tue, 17 Dec 2019 14:59:23 +0100

Peter Ludemann <peter.ludemann <at> gmail.com> writes:

Hi Peter,

> This problem occurs with emacs 26.3 but didn't occur with 25.x.
> Possibly related to bug#33194.

That's a good catch.

> My hypothesis is that emacs is monitoring some files that it shouldn't
> but I need some help in figuring out which files are being monitored
> and whether that is indeed a bug.
>
> When I run a CPU-bound job that also does quite a bit of I/O, emacs
> becomes very unresponsive -- running "top", I see CPU usage for emacs
> go into the 50-100% range.  (Ubuntu 18.04, emacs 26.3 on a 4-CPU
> machine with SSD disk)
>
> The job I'm running is
>    parallel -v --will-cite --keep-order --group -L80 -j8
> (the problem does not go away when I change to "-j3")

You are reading commands from STDIN? Which?

> As far as I know, I don't have any of the output files or directories
> open (I have global-auto-revert-mode set) -- all the outputs go into
> one directory and when I search the Buffer List, I don't see that
> directory.

It might be the default directory of a buffer not bound to a file.

> I upgraded from emacs 25.3 to 26.3 today, with the same .
> emacs.desktop, and the problem wasn't showing with emacs 25.3.

In bug#33194, a patch for Emacs 27.0.50 is mentioned. Do you have a
chance to run this for test?

> Any suggestions on how to track down what's causing the polling?  As I
> mentioned, this didn't happen with emacs 25.3 with the same files
> open. It also doesn't happen when I start 26.3 without the
> .emacs.desktop (that is, with nothing in the Buffer List).

Could you show the contents of .emacs.desktop?

What happens if you set auto-revert-use-notify to nil?

What's the value of (pp file-notify-descriptors) ?

What do you see, if you remove the comment of the message call in
file-notify-handle-event (lisp/filenotify.el, line 93)?

> "strace -c" emacs when not running the CPU/IO job:
> % time     seconds  usecs/call     calls    errors syscall
> ------ ----------- ----------- --------- --------- ----------------
>  31.63    0.009027           3      2950      2534 recvmsg
>  23.19    0.006618           3      2057           poll
>  13.38    0.003819           3      1100           rt_sigprocmask
>  12.10    0.003454          17       209           pselect6
>   9.17    0.002618           6       466           writev
>   7.62    0.002174           5       405           rt_sigreturn
>   1.21    0.000344          57         6           openat
>   0.37    0.000105           4        30         1 read
>   0.31    0.000089           3        26           timerfd_settime
>   0.28    0.000080          11         7           ioctl
>   0.22    0.000064          64         1           vfork
>   0.11    0.000032          11         3           fcntl
>   0.11    0.000030           4         8           close
>   0.09    0.000026           1        51         9 stat
>   0.06    0.000017          17         1           pipe2
>   0.06    0.000016           0        48        11 faccessat
>   0.04    0.000011          11         1           getuid
>   0.03    0.000009           5         2           wait4
>   0.01    0.000003           1         4           write
>   0.00    0.000000           0         3           fstat
>   0.00    0.000000           0         3           lseek
>   0.00    0.000000           0         1           inotify_add_watch
>   0.00    0.000000           0         1         1 readlinkat
> ------ ----------- ----------- --------- --------- ----------------
> 100.00    0.028536                  7383      2556 total

inotify_add_watch is an indication, that file notifications are in
place.

Best regards, Michael.

Message #11 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Peter Ludemann <peter.ludemann <at> gmail.com>
Cc: 38644 <at> debbugs.gnu.org
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Tue, 17 Dec 2019 18:17:04 +0200

> From: Peter Ludemann <peter.ludemann <at> gmail.com>
> Date: Mon, 16 Dec 2019 17:23:30 -0800
> 
> My hypothesis is that emacs is monitoring some files that it shouldn't

Emacs actually monitors the directory of every file whose buffer has
auto-revert-mode turned on, if you use file notifications for
auto-reverting (which is the default).

> When I run a CPU-bound job that also does quite a bit of I/O, emacs
> becomes very unresponsive -- running "top", I see CPU usage for emacs go
> into the 50-100% range.

Does "a bit of I/O" includes creating, deleting, or modifying files in
a directory where you have a file whose buffer has auto-revert-mode?

> As far as I know, I don't have any of the output files or directories
> open (I have global-auto-revert-mode set) -- all the outputs go into one
> directory and when I search the Buffer List, I don't see that
> directory.

Turn off auto-revert-use-notify and try again, would be my advice.

Message #14 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Peter Ludemann <peter.ludemann <at> gmail.com>
Cc: 38644 <at> debbugs.gnu.org
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Tue, 17 Dec 2019 10:27:36 -0800

[Message part 1 (text/plain, inline)]

So many questions (thank-you!) ... I'll try to answer them soon (and there
are also a few experiments I should try first).

But first: I see different versions of this discussion at
https://lists.gnu.org/archive/html/bug-gnu-emacs/2018-10/msg00997.html and
http://emacs.1067599.n8.nabble.com/bug-33194-26-1-Auto-revert-mode-causes-emacs-to-use-100-cpu-whenever-a-file-is-being-written-to-in-ty-tt468378.html#none
(the
former has a 2nd thread, which mentions the patch in Emacs 27) ... what is
the correct way to interact with emacs bugs?


On Tue, 17 Dec 2019 at 08:17, Eli Zaretskii <eliz <at> gnu.org> wrote:

> > From: Peter Ludemann <peter.ludemann <at> gmail.com>
> > Date: Mon, 16 Dec 2019 17:23:30 -0800
> >
> > My hypothesis is that emacs is monitoring some files that it shouldn't
>
> Emacs actually monitors the directory of every file whose buffer has
> auto-revert-mode turned on, if you use file notifications for
> auto-reverting (which is the default).
>
> > When I run a CPU-bound job that also does quite a bit of I/O, emacs
> > becomes very unresponsive -- running "top", I see CPU usage for emacs go
> > into the 50-100% range.
>
> Does "a bit of I/O" includes creating, deleting, or modifying files in
> a directory where you have a file whose buffer has auto-revert-mode?
>
> > As far as I know, I don't have any of the output files or directories
> > open (I have global-auto-revert-mode set) -- all the outputs go into one
> > directory and when I search the Buffer List, I don't see that
> > directory.
>
> Turn off auto-revert-use-notify and try again, would be my advice.
>

[Message part 2 (text/html, inline)]

Message #17 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Peter Ludemann <peter.ludemann <at> gmail.com>
Cc: 38644 <at> debbugs.gnu.org
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Tue, 17 Dec 2019 20:30:26 +0100

Peter Ludemann <peter.ludemann <at> gmail.com> writes:

> But first: I see different versions of this discussion at
> https://lists.gnu.org/archive/html/bug-gnu-emacs/2018-10/msg00997.html
> and
> http://emacs.1067599.n8.nabble.com/bug-33194-26-1-Auto-revert-mode-causes-emacs-to-use-100-cpu-whenever-a-file-is-being-written-to-in-ty-tt468378.html#none
> (the former has a 2nd thread, which mentions the patch in Emacs 27) .
> .. what is the correct way to interact with emacs bugs?

Just reply to this message, and keep 38644 <at> debbugs.gnu.org in Cc. Whether
you keep me (or anybody else) in the list of recipients depends on your taste.

Best regards, Michael.

Message #20 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Peter Ludemann <peter.ludemann <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 38644 <at> debbugs.gnu.org
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Sat, 28 Dec 2019 13:12:24 -0800

[Message part 1 (text/plain, inline)]

> In bug#33194, a patch for Emacs 27.0.50 is mentioned. Do you have a chance
to run this for test?

Emacs 27.0.50 somewhat fixes the problem with global-auto-revert-mode,
using the same desktop file (and same open files) that was causing problems
with Emacs 26.3. (Sorry I took so long to test this.)
Emacs CPU utilization is now ~30-80% (according to top(1)) instead of 100%;
and responsiveness is good. Of course, it would be nicer if emacs CPU
utilization were less, so that I could fully utilize that core (I only have
4 cores, so losing half a core is notable on large tests).

Michael Albinus - you had a number of other questions ... do you still want
them (or some of them) answered?

best,
- peter

PS: Here's the desktop file, in case that can give some clue as to what
file or directory is causing problems. The "compilation" processes both
input from and output into /tmp/pykythe_test -- as you can see, there are a
couple of open files from that directory, but they're not being
continuously updated, only once or twice per test.

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M0BI`8[U:*FSHN)C??IDE(0D0-G;;O7>Q3,>@K*RL4E96/JI2)?GLC.,_\IP?
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end

[Message part 2 (text/html, inline)]

Message #23 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Peter Ludemann <peter.ludemann <at> gmail.com>
Cc: 38644 <at> debbugs.gnu.org
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Sun, 29 Dec 2019 16:23:46 +0100

Peter Ludemann <peter.ludemann <at> gmail.com> writes:

Hi Peter,

>> In bug#33194, a patch for Emacs 27.0.50 is mentioned. Do you have a
>> chance to run this for test?
>
> Emacs 27.0.50 somewhat fixes the problem with global-auto-revert-mode,
> using the same desktop file (and same open files) that was causing
> problems with Emacs 26.3. (Sorry I took so long to test this.)

Thanks for the feedback, the fix in Emacs 27 seems to work.

> Emacs CPU utilization is now ~30-80% (according to top(1)) instead of
> 100%; and responsiveness is good. Of course, it would be nicer if
> emacs CPU utilization were less, so that I could fully utilize that
> core (I only have 4 cores, so losing half a core is notable on large
> tests).

If I count correctly, your desktop file contains 489 buffers. Heavy load
for global-auto-revert-mode.

> Michael Albinus - you had a number of other questions ... do you still
> want them (or some of them) answered?

No, I don't believe so.

> PS: Here's the desktop file, in case that can give some clue as to
> what file or directory is causing problems. The "compilation"
> processes both input from and output into /tmp/pykythe_test -- as you
> can see, there are a couple of open files from that directory, but
> they're not being continuously updated, only once or twice per test.

auto-revert watches directories. Even if you watch only some few files
in a directory (I count 29 buffers which are bound to "/tmp"), there
will be lot of file notification events when other files in that
directory are changed. Maybe it helps to set auto-revert-use-notify to
nil for those files? You could do it via directory-local variales, as in

(dir-locals-set-class-variables 'auto-revert-with-polling
   '((nil . ((auto-revert-use-notify . nil)))))

(dir-locals-set-directory-class
   "/tmp/" 'auto-revert-with-polling)

(This is untested.)

> best,
> - peter

Best regards, Michael.

Message #26 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Peter Ludemann <peter.ludemann <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 38644 <at> debbugs.gnu.org
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Sat, 4 Jan 2020 10:50:16 -0800

[Message part 1 (text/plain, inline)]

A few small comments/questions inline ...

On Sun, 29 Dec 2019 at 07:23, Michael Albinus <michael.albinus <at> gmx.de>
wrote:

> Peter Ludemann <peter.ludemann <at> gmail.com> writes:
>
> Hi Peter,
>
> >> In bug#33194, a patch for Emacs 27.0.50 is mentioned. Do you have a
> >> chance to run this for test?
> >
> > Emacs 27.0.50 somewhat fixes the problem with global-auto-revert-mode,
> > using the same desktop file (and same open files) that was causing
> > problems with Emacs 26.3. (Sorry I took so long to test this.)
>
> Thanks for the feedback, the fix in Emacs 27 seems to work.
>

Correction: Emacs 28.05, cloned from git://git.sv.gnu.org/emacs.git and
built using the instructions at
https://www.emacswiki.org/emacs/EmacsSnapshotAndDebian#toc3


> > Emacs CPU utilization is now ~30-80% (according to top(1)) instead of
> > 100%; and responsiveness is good. Of course, it would be nicer if
> > emacs CPU utilization were less, so that I could fully utilize that
> > core (I only have 4 cores, so losing half a core is notable on large
> > tests).
>
> If I count correctly, your desktop file contains 489 buffers. Heavy load
> for global-auto-revert-mode.
>

This is the result of working on a project for several months (using
emacs-daemon). For example, 94 of those files are from Python and
SWI-Prolog standard libraries, because I needed to get implementation
details ("use the source, Luke"); and I'm using pieces from about 5
packages, whose source I also need to look at.

So, it's a little sloppy, but not unreasonable, I think.


>
> > Michael Albinus - you had a number of other questions ... do you still
> > want them (or some of them) answered?
>
> No, I don't believe so.
>
> > PS: Here's the desktop file, in case that can give some clue as to
> > what file or directory is causing problems. The "compilation"
> > processes both input from and output into /tmp/pykythe_test -- as you
> > can see, there are a couple of open files from that directory, but
> > they're not being continuously updated, only once or twice per test.
>
> auto-revert watches directories. Even if you watch only some few files
> in a directory (I count 29 buffers which are bound to "/tmp"), there
> will be lot of file notification events when other files in that
> directory are changed. Maybe it helps to set auto-revert-use-notify to
> nil for those files? You could do it via directory-local variales, as in
>

If I understand you correctly, Emacs doesn't watch individual files but
instead watches the directories that those files are in ... if a file
changes, then the directory will be changed with the file is
written/closed. Is this a correct understanding? (Presumably the reason for
this is that if files /path/to/dir/A, /path/to/dir/B, /path/to/dir/C are
open in buffers, it suffices to only watch for changes to /path/to/dir; and
if /path/to/dir/D is opened, no change to the watch list is needed.)


>
> (dir-locals-set-class-variables 'auto-revert-with-polling
>    '((nil . ((auto-revert-use-notify . nil)))))
>
> (dir-locals-set-directory-class
>    "/tmp/" 'auto-revert-with-polling)
>
> (This is untested.)
>

I haven't tested this because emacs 28.05 gives me adequate performance and
I can live with turning global-auto-revert on/off when I do a big test
(turning it off makes the test run a bit faster because there's another 0.5
CPU available for the test).

Thanks again!

- peter


> > best,
> > - peter
>
> Best regards, Michael.
>

[Message part 2 (text/html, inline)]

Message #31 received at 38644-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Peter Ludemann <peter.ludemann <at> gmail.com>
Cc: 38644-done <at> debbugs.gnu.org
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Sun, 05 Jan 2020 10:28:20 +0100

Version: 27.1

Peter Ludemann <peter.ludemann <at> gmail.com> writes:

Hi Peter,

> I haven't tested this because emacs 28.05 gives me adequate
> performance and I can live with turning global-auto-revert on/off when
> I do a big test (turning it off makes the test run a bit faster
> because there's another 0.5 CPU available for the test).

So it's OK for you; I'll close the bug.

> Thanks again!
>
> - peter

Best regards, Michael.

Message #34 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: 38644 <at> debbugs.gnu.org
Cc: Michael Albinus <michael.albinus <at> gmx.de>,
 Peter Ludemann <peter.ludemann <at> gmail.com>
Subject: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Sun, 5 Jan 2020 14:04:25 +0100

Just out of curiosity --- did you try setting auto-revert-avoid-polling?
If so, did it have any effect?

Message #37 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Peter Ludemann <peter.ludemann <at> gmail.com>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 38644 <at> debbugs.gnu.org, Michael Albinus <michael.albinus <at> gmx.de>
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Sun, 5 Jan 2020 11:31:51 -0800

[Message part 1 (text/plain, inline)]

Mattias:

Are you asking if I've tried this:

(dir-locals-set-class-variables 'auto-revert-with-polling
   '((nil . ((auto-revert-use-notify . nil)))))

(dir-locals-set-directory-class
   "/tmp/" 'auto-revert-with-polling)

No, I haven't.

Which version of Emacs would you like me to try this with? And what result
are you expecting/hoping to see? (e.g., might it reduce the current 30-80%
CPU load for polling with emacs 28.0.50?) There are only a few open files
directly under /tmp, so would this have any effect or does it propagate
down to subdirectories?

[Also, I'd need a few more details (not being an emacs-internals person)
... should I add this to my .emacs and restart, or execute in a scratch
buffer, or ...?]

On Sun, 5 Jan 2020 at 05:05, Mattias Engdegård <mattiase <at> acm.org> wrote:

> Just out of curiosity --- did you try setting auto-revert-avoid-polling?
> If so, did it have any effect?
>
>

[Message part 2 (text/html, inline)]

Message #40 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Peter Ludemann <peter.ludemann <at> gmail.com>
Cc: 38644 <at> debbugs.gnu.org, Michael Albinus <michael.albinus <at> gmx.de>
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Sun, 5 Jan 2020 20:57:42 +0100

5 jan. 2020 kl. 20.31 skrev Peter Ludemann <peter.ludemann <at> gmail.com>:

> Which version of Emacs would you like me to try this with? And what result are you expecting/hoping to see? (e.g., might it reduce the current 30-80% CPU load for polling with emacs 28.0.50?) There are only a few open files directly under /tmp, so would this have any effect or does it propagate down to subdirectories?
> 
> [Also, I'd need a few more details (not being an emacs-internals person) ... should I add this to my .emacs and restart, or execute in a scratch buffer, or ...?]

'auto-revert-avoid-polling' is a single global customisable variable, so you would set it using

 M-x customise-variable RET auto-revert-avoid-polling RET

, then turn it on and apply the change. I believe it was introduced in Emacs 27.

The idea is to save CPU by not having to look at files periodically to see if they have changed. I have no idea if you would see any improvement at all, but it shouldn't make anything worse.

Message #43 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Peter Ludemann <peter.ludemann <at> gmail.com>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 38644 <at> debbugs.gnu.org, Michael Albinus <michael.albinus <at> gmx.de>
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Mon, 6 Jan 2020 16:01:22 -0800

[Message part 1 (text/plain, inline)]

If anything, auto-revert-avoid-polling makes responsiveness worse -- the
window locked up a few times on me while doing ctrl-N while running a
CPU-intensive (and possibly IO-intensive) compilation.
Although I might not have set the value correctly ... I did M-x
customise-variable RET auto-revert-avoid-polling RET then "toggle" then
"apply".
.

On Sun, 5 Jan 2020 at 11:57, Mattias Engdegård <mattiase <at> acm.org> wrote:

> 5 jan. 2020 kl. 20.31 skrev Peter Ludemann <peter.ludemann <at> gmail.com>:
>
> > Which version of Emacs would you like me to try this with? And what
> result are you expecting/hoping to see? (e.g., might it reduce the current
> 30-80% CPU load for polling with emacs 28.0.50?) There are only a few open
> files directly under /tmp, so would this have any effect or does it
> propagate down to subdirectories?
> >
> > [Also, I'd need a few more details (not being an emacs-internals person)
> ... should I add this to my .emacs and restart, or execute in a scratch
> buffer, or ...?]
>
> 'auto-revert-avoid-polling' is a single global customisable variable, so
> you would set it using
>
>  M-x customise-variable RET auto-revert-avoid-polling RET
>
> , then turn it on and apply the change. I believe it was introduced in
> Emacs 27.
>
> The idea is to save CPU by not having to look at files periodically to see
> if they have changed. I have no idea if you would see any improvement at
> all, but it shouldn't make anything worse.
>
>

[Message part 2 (text/html, inline)]

Message #46 received at 38644 <at> debbugs.gnu.org (full text, mbox):

From: Peter Ludemann <peter.ludemann <at> gmail.com>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 38644 <at> debbugs.gnu.org, Michael Albinus <michael.albinus <at> gmx.de>
Subject: Re: bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
Date: Mon, 6 Jan 2020 16:34:19 -0800

[Message part 1 (text/plain, inline)]

Correction -- the "lock-up" I observed might have been due to paging
(possibly related to emacs - I'll have to investigate later).
Toggling auto-revert-avoid-polling appeared to reduc emacs CPU usage,
according to top(1) - it's a bit difficult to tell because there seems to
be some lag in when the command takes effect and my compilation process
switches a certain amount between CPU-intensive and IO-intensive. Anyway,
CPU seemed to drop from ~60% to ~30% (please take this observation with a
large grain of salt).
I'll try more things in the future and report if anything interesting shows
up.
- peter

On Mon, 6 Jan 2020 at 16:01, Peter Ludemann <peter.ludemann <at> gmail.com>
wrote:

> If anything, auto-revert-avoid-polling makes responsiveness worse -- the
> window locked up a few times on me while doing ctrl-N while running a
> CPU-intensive (and possibly IO-intensive) compilation.
> Although I might not have set the value correctly ... I did M-x
> customise-variable RET auto-revert-avoid-polling RET then "toggle" then
> "apply".
> .
>
> On Sun, 5 Jan 2020 at 11:57, Mattias Engdegård <mattiase <at> acm.org> wrote:
>
>> 5 jan. 2020 kl. 20.31 skrev Peter Ludemann <peter.ludemann <at> gmail.com>:
>>
>> > Which version of Emacs would you like me to try this with? And what
>> result are you expecting/hoping to see? (e.g., might it reduce the current
>> 30-80% CPU load for polling with emacs 28.0.50?) There are only a few open
>> files directly under /tmp, so would this have any effect or does it
>> propagate down to subdirectories?
>> >
>> > [Also, I'd need a few more details (not being an emacs-internals
>> person) ... should I add this to my .emacs and restart, or execute in a
>> scratch buffer, or ...?]
>>
>> 'auto-revert-avoid-polling' is a single global customisable variable, so
>> you would set it using
>>
>>  M-x customise-variable RET auto-revert-avoid-polling RET
>>
>> , then turn it on and apply the change. I believe it was introduced in
>> Emacs 27.
>>
>> The idea is to save CPU by not having to look at files periodically to
>> see if they have changed. I have no idea if you would see any improvement
>> at all, but it shouldn't make anything worse.
>>
>>

[Message part 2 (text/html, inline)]

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