[rrd-users] Re: Monitoring CPU stats on Linux? Watch your jiffies.

Fabien Wernli wernli at in2p3.fr
Sat Dec 10 21:52:57 MET 2005


On Fri, Dec 09, 2005 at 12:59:29PM -0700, Clay Chambers wrote:
> It seems that under extremely heavy load, the idle counter actually
> goes down due to rounding.  (I'm not completely certain that it's due
> to rounding, but that's the most plausible cause I've come up with.) 
> The result is that your CPU utilization graphs could show 0% when
> they're actually at 100% utilization.

I have constant inaccuracies watching /proc/stats. However in my experience
they happen mostly during heavy io_wait activity.

See example:


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