CPU % get erratic for long running high CPU processes

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CPU % get erratic for long running high CPU processes

Postby nikkiauburger » 2013-11-13 22:47

In debian 6 and 7 (and possibly others) with a variety of kernels, our observations have been the same: running a high CPU process for a long time (say 400% cpu usage for three weeks) at first shows correct usage numbers, but after a while (shorter with higher usage) inevitably corrupts some mechanism that registers CPU activity, yielding numbers like 110413, 5320921 or simply 0 in both ps and top.

Does anyone have any idea what this is? We've observed it on a wide variety of hardware, kernels and other configurations.
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Re: CPU % get erratic for long running high CPU processes

Postby tomazzi » 2013-11-15 23:13

You should fill a bug report, providing details about the hardware, kernel versions, software used etc.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=639539
Are Your kernels patched against this "bug"? (which is not essentially a bug, but just different approach to measure average load, excluding sleeping processes)
Odi profanum vulgus
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