Monitoring CPU usage on SMP linux machines

[Aaron M. Segura]

On Wed, 2008-01-30 at 17:20 -0500, Edson Manners wrote:
> Hi,
>        I haven't been able to find a solution to this through google or 
> the ngaios . I had previously made
> a custom script to get CPU data from snmpd using OID 
> 1.3.6.1.4.1.2021.11.9 for Linux and OID 1.3.6.1.2.1.25.3.3.1.2
> for windows. However the Linux machines snmpd implementation don't seem 
> to take SMP CPUs into account and
> I am getting back bogus data.
> 
> My question is how are others monitoring CPU usage on SMP Linux servers 
> using nagios?
> Thanks

My script queries "ssCpuRawKernel.0", "ssCpuRawIdle.0", and
"ssCpuRawUser.0" as provided by net-snmp and does some simple division
using values written to a 'state' file on the last run to figure out the
overall CPU % Used, regardless of the number of CPUs.  I don't believe
I've posted this one on nagiosexchange, but I'd be glad to send it to
you if you care to take a look.


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