Originally posted by: tpeponas

Hello,

What is the difference beetwen processor PCM stats and SharedProcessorPool ?

I have a server with 48 processor avaible (total 128 installed) and  the default shared processor pool contains 48 proc.

Requesting  ProcessesMetric with Rest API , i have not the same value for Processor and SharedProcessorPool into the  JSON  return :

for processor :

{
          'totalProcUnits' => [
                                128
                              ],
          'configurableProcUnits' => [
                                       48
                                     ],
          'utilizedProcUnits' => [
                                   '14.726'
                                 ],
          'availableProcUnits' => [
                                    '8.4'
                                  ]
        };

For SharedProcessorPool :

{
          'availableProcUnits' => [
                                    0
                                  ],
          'utilizedProcUnits' => [
                                   '22.373'
                                 ],
          'id' => 0,
          'assignedProcUnits' => [
                                   '47.999'
                                 ],
          'borrowedProcUnits' => [
                                   8
                                 ],
          'configuredProcUnits' => [
                                     '39.6'
                                   ],
          'name' => 'DefaultPool'
        };

Regards,

Thomas

Originally posted by: dyutiman

Hi,

Thanks for reaching out. 

Please find the definitions below for reference:

I can see the availableProcUnits for Shared Processor Pool coming as zero, which is not correct. I have opened a work item to fix this issue and the fix will be available in upcoming realease and service packs. 

For other attributes, the Shared Processor Pool also includes donated cycles from partition in the calculation and may give different result than processor metrics. I will look into them in more details and get back to you about what exactly the cause of these differences.

- thanks

Originally posted by: tpeponas

Hi dyutiman

Thanks for response , I understand better now

With my test it seems Shared Processor Pool also include idleProcCycles. Donated Cycles are always zero on my LPAR.

regards,

Thomas.

Originally posted by: dyutiman

Hi Thomas,

Thankns for the info. I will check this in detail at my end and update you. In the mean time you can keep the below link for your reference about all the attributes we expose in PCM.

https://www-01preview.ibm.com/support/knowledgecenter/POWER9/p9ehl/concepts/PerformanceCapacityMonitorJsonSpecification.htm

I hope this will help.

thanks

Originally posted by: dyutiman

Hi,

I guess you are right. idleProcCycles is taken into consideration while reporting Shared Processor Pool utilization.

Thanks