Re: Processor usage

If you have turned on the ability for the IBM i to collect physical system data, you can use the Performance Data Investigator to review your physical processor usage.

On the HMC, for the IBM i partition you want to collect the data, you must check the “Allow performance information collection” option. On the new HMC, you go to the general properties for partition you want to allow the data collection. The default is off, because turning this on allows you to see information about every partition on the physical server.

When you enable this data collection, Collection Services will start collecting this hypervisor performance data at the next collection interval - no restart of any kind is needed. There is essentially zero overhead on the IBM i; the hypervisor performance collection is always on and this setting on the HMC is simply allowing that partition to harvest those metrics. There are a few additional Collection Services files that will be created, but the disk space used is small.

Once you are collecting this data. there is a set of charts in the Performance Data Investigator where you can look at this data. You find them in the Collection Services content package, in a grouping called “Physical System”.

There is a chart called "Physical Processors Utilization by Physical Processor” which shows the average processor utilization for each processor in the system. Note this data is for the physical server, not a specific partition. There are drill-downs available that show the utilization of a particular processor over time.

There are other charts in the Physical System grouping you may find interesting as well.
One nice use-case is understanding the interaction of CPU sharing between logical partitions in a shared processor pool.

Dawn

On Sep 21, 2022, at 12:42 PM, DEnglander--- via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx> wrote:

Does anyone know how I can tell what percentage of each processor in a
multi-processor system is used on a regular basis?

For example, if I have a two processors enabled on a system with four
processors installed, I would need to know if the two processors
[hopefully alone or combined] would have a usage at 50% or more, or less
than 20%, and then which processor is doing the most work.

Thank you,

Doug



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