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VMWare, esxtop

Posted on 2013-11-05
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Last Modified: 2013-11-14
I am using esxtop on my system:    I am running HT

I have three values

PCPU USED  (AVG)
PCPU UTIL (AVG)
CORE UTIL (AVG)

which of these three averages represent the utilization for the ESXi system.

I am guessing its the avg of PCPU UTIL ?

Thanks
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Question by:Los Angeles1
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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
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Do you not remember you asked the same question here in March 2012, I remembered!

This is cut and paste from this question I answered in March 2012...

CPU

CPU load average of 1.00 means full utilisation of all CPU’s. A load of 2.00 means the host is using twice as many physical CPU’s as are currently available, likewise 0.50 means half are being utilised.

CPU Screen

PCPU USED(%) – Physical hardware execution context. Can be a physical CPU core if hyperthreading is unavilable or disabled or a logical CPU (LCPU) or SMT thread if hyperthreading is enabled. This displays PCPU percentage of CPU usage when averaged over all PCPUs.

PCPU UTIL(%) - Physical CPU utilised. (real time) Indicates how much time the PCPU was busy, in an unhalted state, in the last snapshot duration. Might differ from PCPU USED(%) due to power management technologies or hyperthreading.

If hyper threading is enabled these figures can be different, likewise if the frequency of the PCPU is changed due to power management these figures can also be adjusted.

As an example if PCPU USED(%) is 100 and PCPU UTIL(%) is 50 this is because hyper threading is splitting the load across the two PCPUs. If you then look in the vSphere client you may notice that CPU usage is 100%. This is because the vSphere client will double the statistics if hyperthreading is enabled.

In a dual core system, each PCPU is charged by the CPU scheduler half of the elapsed time when both PCPUs are busy.

Source
http://www.experts-exchange.com/Software/VMWare/Q_27637187.html

Also see my EE Article


HOW TO:  Performance Monitor vSphere 4.x or 5.0
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