Re: Linux number of CPUs?

2008/12/30 Les Mikesell <[email protected]>:
> On Linux, how should a monitoring program scale the load average and cpu
> use values to determine when a machine has reached capacity? Is there a
> way to get the number of CPUs from linux net-snmp, or per-cpu  usage values?

Which version of the agent are you using?

The HOST-RESOURCES-MIB::hrProcessorTable should report the number
of processors detected.   But agents up to (and including)l the 5.3.x line
fudged the hrProcessorLoad object, and simply returned a common value
based on the overall load average.

The 5.4.x agent now attempts to report this value properly.

Note that the UCD-SNMP-MIB cpu statistics and load average objects
are overall values, and do not handle individual CPUs.



[email protected] wrote
> RFC 2790 HOST-RESOURCES-MIB is defined for managing host systems.
> This has objects which give information about CPU usage (in no of
> centi-seconds) by each process.

Note that these objects refer to the usage of individual running processes,
not how busy each CPU might be.
   That's the role of the hrProcessorLoad object.

Dave

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