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sventhanFlag for United States of America

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CPU usage

Hi -

We have a IBM AIX server using LPAR. This has 9 physical cpus (entitled) and 80 logical cpus. The logical CPU % of Utilization is never matching with the physical cpu utilization. When Physical CPU maxed out the logical CPU still showing only 30% of usage.

Please find the attached excel sheet for more details.

IF you look at the LPAR tab in the given excel, when the entitled cpu usage maxed out, the logical and physical should report the same % of CPU utilization.

Thanks!

Sve.
Book15.zip
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gheist
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Aix server model please...
uname -r
And explain what problem you are trying to solve.

 physical CPU is hared between virtual CPUs, and virtual one is waiting for IO while rest of
physical CPU power is used by other virtual CPUs. the numbers will never add up

Please unzip document yourself, i am not good at peeling onions.
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ASKER

Thanks for your time. I've peeled the onion for you.

The Question is,

How 1 Physical CPU match with the X logical CPU?  How this is getting configured?

When all the CPUs being used , PCPU = 100% why lcpu is only 30%?

What is the ratio between these 2 cpus?

Thanks,
sve.
Book15.xlsx
ASKER CERTIFIED SOLUTION
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gheist
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Thanks