VMWare, esxtop and host CPU utilization

I can bring my VM up to about 35 percent CPU in the OS, and 60 percent in the VM, as reported by the GUI

I want to see what the Host is doing in CPU

When I go to esxtop, it says that 'system' and 'helper' are at zero percent idle

When I am running something or not

How do I determine what the host CPU from esxtop ?

I thought I would judge this from 'system' and 'helper'
Los Angeles1Asked:
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Aaron TomoskySD-WAN SimplifiedCommented:
How many cores does the CPU have? How many vcpu did you assign the guest?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Don't forget CPU Usage is always available from the vSphere Client and Performance Monitor Graphs.

esxtop
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.
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Los Angeles1Author Commented:
k, I think I understand what you are saying, but how do I determine the CPU utilization used by the actual hypervisor, or is that a concept that is used by VMWare
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
your question states CPU utilization of the host? the host runs the hypervisor, the Host OS.
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Los Angeles1Author Commented:
In the example you showed, you discuss the CPU load average (util of all CPU),  PCPUUSED and PCUUTIL.

Still do not understand which of these numbers  are showing the utilization of the hypervisor

In the example you displayed above, what is the utilization of the CPU's used by the hypervisor ?  (ie, what number)
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
CPU

load average of 1.00 means 100% of ALL CPUs in the host.

0.5 is 50%

2.00 is x2 as many physical CPUs as available.

load average is 0.1 so 10%
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Los Angeles1Author Commented:
1> So if I understand you correctly, the hypervisor util is ten percent ?

2> Can I assume from the example above that the hypervisor is running on 3 virtual CPUs

Thanks
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
1. correct

2. 2 VMs are using 3 vCPUs
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Los Angeles1Author Commented:
So in the example below


11:10:57pm up 6 days  4:15, 323 worlds, 1 VMs, 8 vCPUs; CPU load average: 0.35, 0.07, 0.03

Open in new window


1> What is the hyperthreading CPU

2> what is the .35 number

3>  What is the .07 number

4>  What is the .03 number ?

Thanks
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Average load values over time.

The arithmetic mean of CPU loads in 1 minute, 5 minutes, and 15 minutes, based on 6-second samples.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I believe your original question has been answered. If this answer has been helpful please assign points. If you have any further questions about esxtop, please post another question and myself or other Experts will be happy to assit.
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