[hobbit] Feature request - thresholds for CPU utilisation (not load average)

[Josh Luthman]

Thirdsies!

On 2/28/08, Kauffman, Tom <KauffmanT at nibco.com> wrote:
>
> I'll second that.
>
> I just found out we had a test system that has had an oracle process using
> 99% of one cpu for the past (drumroll!) two months and we didn't notice it!
>
> Tom Kauffman
> NIBCO, Inc
>
>
> -----Original Message-----
> From: Buchan Milne [mailto:bgmilne at staff.telkomsa.net]
> Sent: Thursday, February 28, 2008 1:44 PM
> To: hobbit at hswn.dk
> Subject: [hobbit] Feature request - thresholds for CPU utilisation (not
> load average)
>
> Something I have been wondering about for a while is whether it would be
> possible to have thresholds on the CPU utilisation. While we have
> thresholds
> for load averages, in some cases these have to be relatively high (e.g. 2
> to
> 4 times the number of CPUs) due to the impact of IO wait on load average
> (e.g, our SAN-attached NFS servers often have a load average of over 10,
> with
> a CPU utilisation of 50%, when reading over 10k blocks/sec). However, it
> then
> makes it difficult to catch a process in CPU-race (as much less IO gets
> done,
> IO wait is low, and load average is almost exactly 1 *CPUs).
>
> The CPU utilisation is already reported (in the vmstat data), which is how
> I
> know the above about our NFS servers (vmstat/vmstat1 graph).
>
> This would also remove the complication of thresholds differing between
> servers with different numbers of CPUs, and maybe work better for Windows
> clients (which don't seem to have a concept of load average).
>
> (I don't mean thresholds for load average should be removed ... I would
> love
> to have thresholds for both load average and CPU utilisation).
>
> Regards,
> Buchan
>
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-- 
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
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Those who don't understand UNIX are condemned to reinvent it, poorly.
--- Henry Spencer
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