* bug#22305: 24.5; permanent 100% CPU load for no apparent reason
@ 2016-01-04 16:48 Roland Winkler
2016-01-04 17:16 ` Eli Zaretskii
0 siblings, 1 reply; 5+ messages in thread
From: Roland Winkler @ 2016-01-04 16:48 UTC (permalink / raw)
To: 22305
Lately emacs gives me some strange problem, where according to `top'
the CPU load due to the emacs process goes up to a permanent value
of 100% (and I notice this because the laptop fan starts spinning
loudly), whereas according to `ps' the emacs process continues to
give rise to only a marginal CPU load. While this happens, emacs
responds normally, so it appears that emacs is not trying to do
anything unusual in the background.
I did not have this problem while I was using emacs 24.5 under
ubuntu 14.04. It only appeared lately when I upgraded to a new
laptop running ubuntu 15.10. I am not aware of any significant
change in my emacs configuration since I made this switch.
What can I do to pin this down further? So far, I have not noticed
anything that triggers this behavior reproducibly and my workaround
has been to restart emacs. But that's not nice for a recurring
problem (about once per day).
In GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.7)
of 2015-11-24 on regnitz
Windowing system distributor `The X.Org Foundation', version 11.0.11702000
System Description: Ubuntu 15.10
Important settings:
value of $LC_COLLATE: C
value of $LANG: en_US.utf8
value of $XMODIFIERS:
locale-coding-system: utf-8-unix
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#22305: 24.5; permanent 100% CPU load for no apparent reason
2016-01-04 16:48 bug#22305: 24.5; permanent 100% CPU load for no apparent reason Roland Winkler
@ 2016-01-04 17:16 ` Eli Zaretskii
2016-01-04 17:47 ` Roland Winkler
2016-01-04 18:33 ` Michael Heerdegen
0 siblings, 2 replies; 5+ messages in thread
From: Eli Zaretskii @ 2016-01-04 17:16 UTC (permalink / raw)
To: Roland Winkler; +Cc: 22305
> Date: Mon, 4 Jan 2016 10:48:02 -0600
> From: "Roland Winkler" <winkler@gnu.org>
>
> Lately emacs gives me some strange problem, where according to `top'
> the CPU load due to the emacs process goes up to a permanent value
> of 100% (and I notice this because the laptop fan starts spinning
> loudly), whereas according to `ps' the emacs process continues to
> give rise to only a marginal CPU load. While this happens, emacs
> responds normally, so it appears that emacs is not trying to do
> anything unusual in the background.
Not necessarily. AFAIR, 'top' shows the CPU usage of each program in
terms of processor execution units. IOW, 100% means Emacs is pegging
a single execution unit. How many execution units (cores) do you have
on that system?
> What can I do to pin this down further? So far, I have not noticed
> anything that triggers this behavior reproducibly and my workaround
> has been to restart emacs. But that's not nice for a recurring
> problem (about once per day).
When this happens, attach a debugger and show us the backtrace,
including the Lisp backtrace.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#22305: 24.5; permanent 100% CPU load for no apparent reason
2016-01-04 17:16 ` Eli Zaretskii
@ 2016-01-04 17:47 ` Roland Winkler
2016-12-07 18:57 ` Glenn Morris
2016-01-04 18:33 ` Michael Heerdegen
1 sibling, 1 reply; 5+ messages in thread
From: Roland Winkler @ 2016-01-04 17:47 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 22305
On Mon Jan 4 2016 Eli Zaretskii wrote:
> Not necessarily. AFAIR, 'top' shows the CPU usage of each program
> in terms of processor execution units. IOW, 100% means Emacs is
> pegging a single execution unit.
Sure. My point is that normally `top' says that my emacs session
does not take more than 2 or 3% CPU load. Yet suddenly this goes up
to 100% and the fan starts running loudly, too.
> How many execution units (cores) do you have on that system?
`lshw' says
Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz
which, I believe, comes with four cores.
> When this happens, attach a debugger and show us the backtrace,
> including the Lisp backtrace.
Thanks, will do that.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#22305: 24.5; permanent 100% CPU load for no apparent reason
2016-01-04 17:16 ` Eli Zaretskii
2016-01-04 17:47 ` Roland Winkler
@ 2016-01-04 18:33 ` Michael Heerdegen
1 sibling, 0 replies; 5+ messages in thread
From: Michael Heerdegen @ 2016-01-04 18:33 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: Roland Winkler, 22305
Eli Zaretskii <eliz@gnu.org> writes:
> When this happens, attach a debugger and show us the backtrace,
> including the Lisp backtrace.
Using profiler.el might also reveal what Emacs is doing.
Michael.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-12-07 18:57 UTC | newest]
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2016-01-04 16:48 bug#22305: 24.5; permanent 100% CPU load for no apparent reason Roland Winkler
2016-01-04 17:16 ` Eli Zaretskii
2016-01-04 17:47 ` Roland Winkler
2016-12-07 18:57 ` Glenn Morris
2016-01-04 18:33 ` Michael Heerdegen
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