* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
@ 2019-12-17 1:23 Peter Ludemann
2019-12-17 13:59 ` Michael Albinus
` (2 more replies)
0 siblings, 3 replies; 14+ messages in thread
From: Peter Ludemann @ 2019-12-17 1:23 UTC (permalink / raw
To: 38644
[-- Attachment #1: Type: text/plain, Size: 12094 bytes --]
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
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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))
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^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2019-12-17 1:23 bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode Peter Ludemann
@ 2019-12-17 13:59 ` Michael Albinus
2019-12-17 16:17 ` Eli Zaretskii
2020-01-05 13:04 ` Mattias Engdegård
2 siblings, 0 replies; 14+ messages in thread
From: Michael Albinus @ 2019-12-17 13:59 UTC (permalink / raw
To: Peter Ludemann; +Cc: 38644
Peter Ludemann <peter.ludemann@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.
^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2019-12-17 1:23 bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode Peter Ludemann
2019-12-17 13:59 ` Michael Albinus
@ 2019-12-17 16:17 ` Eli Zaretskii
2019-12-17 18:27 ` Peter Ludemann
2020-01-05 13:04 ` Mattias Engdegård
2 siblings, 1 reply; 14+ messages in thread
From: Eli Zaretskii @ 2019-12-17 16:17 UTC (permalink / raw
To: Peter Ludemann; +Cc: 38644
> From: Peter Ludemann <peter.ludemann@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.
^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2019-12-17 16:17 ` Eli Zaretskii
@ 2019-12-17 18:27 ` Peter Ludemann
2019-12-17 19:30 ` Michael Albinus
0 siblings, 1 reply; 14+ messages in thread
From: Peter Ludemann @ 2019-12-17 18:27 UTC (permalink / raw
Cc: 38644
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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@gnu.org> wrote:
> > From: Peter Ludemann <peter.ludemann@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.
>
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^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2019-12-17 18:27 ` Peter Ludemann
@ 2019-12-17 19:30 ` Michael Albinus
2019-12-28 21:12 ` Peter Ludemann
0 siblings, 1 reply; 14+ messages in thread
From: Michael Albinus @ 2019-12-17 19:30 UTC (permalink / raw
To: Peter Ludemann; +Cc: 38644
Peter Ludemann <peter.ludemann@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@debbugs.gnu.org in Cc. Whether
you keep me (or anybody else) in the list of recipients depends on your taste.
Best regards, Michael.
^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2019-12-17 19:30 ` Michael Albinus
@ 2019-12-28 21:12 ` Peter Ludemann
2019-12-29 15:23 ` Michael Albinus
0 siblings, 1 reply; 14+ messages in thread
From: Peter Ludemann @ 2019-12-28 21:12 UTC (permalink / raw
To: Michael Albinus; +Cc: 38644
[-- Attachment #1: Type: text/plain, Size: 29452 bytes --]
> 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.
begin 644 bug38644-desktop.gz
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end
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^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2019-12-28 21:12 ` Peter Ludemann
@ 2019-12-29 15:23 ` Michael Albinus
2020-01-04 18:50 ` Peter Ludemann
0 siblings, 1 reply; 14+ messages in thread
From: Michael Albinus @ 2019-12-29 15:23 UTC (permalink / raw
To: Peter Ludemann; +Cc: 38644
Peter Ludemann <peter.ludemann@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.
^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2019-12-29 15:23 ` Michael Albinus
@ 2020-01-04 18:50 ` Peter Ludemann
2020-01-05 9:28 ` Michael Albinus
0 siblings, 1 reply; 14+ messages in thread
From: Peter Ludemann @ 2020-01-04 18:50 UTC (permalink / raw
To: Michael Albinus; +Cc: 38644
[-- Attachment #1: Type: text/plain, Size: 3450 bytes --]
A few small comments/questions inline ...
On Sun, 29 Dec 2019 at 07:23, Michael Albinus <michael.albinus@gmx.de>
wrote:
> Peter Ludemann <peter.ludemann@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.
>
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^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2020-01-04 18:50 ` Peter Ludemann
@ 2020-01-05 9:28 ` Michael Albinus
0 siblings, 0 replies; 14+ messages in thread
From: Michael Albinus @ 2020-01-05 9:28 UTC (permalink / raw
To: Peter Ludemann; +Cc: 38644-done
Version: 27.1
Peter Ludemann <peter.ludemann@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.
^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2019-12-17 1:23 bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode Peter Ludemann
2019-12-17 13:59 ` Michael Albinus
2019-12-17 16:17 ` Eli Zaretskii
@ 2020-01-05 13:04 ` Mattias Engdegård
2020-01-05 19:31 ` Peter Ludemann
2 siblings, 1 reply; 14+ messages in thread
From: Mattias Engdegård @ 2020-01-05 13:04 UTC (permalink / raw
To: 38644; +Cc: Michael Albinus, Peter Ludemann
Just out of curiosity --- did you try setting auto-revert-avoid-polling?
If so, did it have any effect?
^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2020-01-05 13:04 ` Mattias Engdegård
@ 2020-01-05 19:31 ` Peter Ludemann
2020-01-05 19:57 ` Mattias Engdegård
0 siblings, 1 reply; 14+ messages in thread
From: Peter Ludemann @ 2020-01-05 19:31 UTC (permalink / raw
To: Mattias Engdegård; +Cc: 38644, Michael Albinus
[-- Attachment #1: Type: text/plain, Size: 939 bytes --]
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@acm.org> wrote:
> Just out of curiosity --- did you try setting auto-revert-avoid-polling?
> If so, did it have any effect?
>
>
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^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2020-01-05 19:31 ` Peter Ludemann
@ 2020-01-05 19:57 ` Mattias Engdegård
2020-01-07 0:01 ` Peter Ludemann
0 siblings, 1 reply; 14+ messages in thread
From: Mattias Engdegård @ 2020-01-05 19:57 UTC (permalink / raw
To: Peter Ludemann; +Cc: 38644, Michael Albinus
5 jan. 2020 kl. 20.31 skrev Peter Ludemann <peter.ludemann@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.
^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2020-01-05 19:57 ` Mattias Engdegård
@ 2020-01-07 0:01 ` Peter Ludemann
2020-01-07 0:34 ` Peter Ludemann
0 siblings, 1 reply; 14+ messages in thread
From: Peter Ludemann @ 2020-01-07 0:01 UTC (permalink / raw
To: Mattias Engdegård; +Cc: 38644, Michael Albinus
[-- Attachment #1: Type: text/plain, Size: 1491 bytes --]
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@acm.org> wrote:
> 5 jan. 2020 kl. 20.31 skrev Peter Ludemann <peter.ludemann@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.
>
>
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^ permalink raw reply [flat|nested] 14+ messages in thread
* bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode
2020-01-07 0:01 ` Peter Ludemann
@ 2020-01-07 0:34 ` Peter Ludemann
0 siblings, 0 replies; 14+ messages in thread
From: Peter Ludemann @ 2020-01-07 0:34 UTC (permalink / raw
To: Mattias Engdegård; +Cc: 38644, Michael Albinus
[-- Attachment #1: Type: text/plain, Size: 2234 bytes --]
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@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@acm.org> wrote:
>
>> 5 jan. 2020 kl. 20.31 skrev Peter Ludemann <peter.ludemann@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.
>>
>>
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^ permalink raw reply [flat|nested] 14+ messages in thread
end of thread, other threads:[~2020-01-07 0:34 UTC | newest]
Thread overview: 14+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2019-12-17 1:23 bug#38644: 26.3; emacs uses 100% CPU with auto-revert-mode Peter Ludemann
2019-12-17 13:59 ` Michael Albinus
2019-12-17 16:17 ` Eli Zaretskii
2019-12-17 18:27 ` Peter Ludemann
2019-12-17 19:30 ` Michael Albinus
2019-12-28 21:12 ` Peter Ludemann
2019-12-29 15:23 ` Michael Albinus
2020-01-04 18:50 ` Peter Ludemann
2020-01-05 9:28 ` Michael Albinus
2020-01-05 13:04 ` Mattias Engdegård
2020-01-05 19:31 ` Peter Ludemann
2020-01-05 19:57 ` Mattias Engdegård
2020-01-07 0:01 ` Peter Ludemann
2020-01-07 0:34 ` Peter Ludemann
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