On 31/05/14 12:43 PM, William Unruh wrote:
In linux.debian.user, you wrote:
I'm running Debian/Jessie on an AMD64 system using KDE. My system
periodically grinds to a halt for a minute or so then resumes as if
nothing had happened. This only happens when I'm running KDE. Gnome and
xfce work properly, even with the same applications open.
I recently installed Gkrellm (using default settings) to see what is
happening when my system grinds to a halt. The only unusual part I see
in it is that the procs box has the brown line climbing to the top of
the chart. Interestingly, the slope of the brown line continues
throughout the slowdown, which suggests that whatever it is measuring is
continuing to increase.
That is the number of processes that are running
The blue/green things there are how many forks there are within some
process.
Possibly not. Sorry, I'm actually using the "prev" theme, not the
default one (right-click on the header, select theme | prev). This shows
the number of procs as a number. The number remains fairly steady over
time. Under xfce (which I am currently using - this KDE problem is just
too annoying), the (proc) brown line floats around a bit while the blue
chart shows lots of spikes. Under KDE, the brown line goes well above
the blue spikes. On the disk chart, the brown and blue charts show
spikes in xcfe but jump to a solid high level under KDE during the
slowdown - although I do have one saved screenshot where the disk
activity shows a high number but the brown and blue charts are both at a
low level.
There is also a sudden increase in disk activity. The two seem to be
related as the disk activity does seem to happen only when the computer
gets slow.
It could be swapping.
top will show swap useage. anything about about 1% of the swap memory
used suggests things have gotten swapped out, which means your memory
filled up and that will certainly slow things down (disk is about 1/1000
the speed of real memory)
I thought about that too, but it's not.
The slowdown ends when the brown line in the proc box starts dropping.
I'm not sure what the line is supposed to be showing. Simultaneously the
disk activity drops dramatically. Usually the disk activity is measured
in k but when the computer slows down, it jumps up to M.
Iotop output doesn't show any particular process doing anything unusual.
The same goes for top. Even Gkrellm doesn't show any significant CPU
activity.
I have 16G of ram so the swap partition is barely used. Turning it off
seems to have no impact on performance.
OK, so swapping is not the problem.
Also it could be that various "helper programs" (msec, akonida,
updatedb) are reviewing stuff in your computer.
Probably, but with top and iotop not showing any significant activity
for any process, how can I track down which one?
Any ideas on what would be causing a periodic slowdown in KDE? Or any
suggestions on how to identify the source of the problem?
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