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.
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.
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.
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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