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HOST CPU utilization

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HOST CPU utilization

Postby guest » Wed May 20, 2009 10:09 am

I'm trying to asses how much load from each VM I can have on 1 single HOSTS
before the HOST CPU utilization is around 80%.

I have a HOST server with 2 Xeon Quad Core 64Bit CPU's with 16GB RAM. I
setup 4 VM's configured with 4 core cpu's, 2 GB RAM running Win 2008 std. I
have a CPU stress tool that will stress each CPU core to 100% utilization.
When I run this tool on all 4 VM's and stress all corse to 100%, the HOSTS
actual CPU utilization per task manager is hardly registering anything
(<1-2%). Is this correct? Hard to beleive. Is there a better way to test
this? Do you recommend a CPU stress tool if you think that's the issue?
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Postby guest » Wed May 20, 2009 10:09 am

Firstly, you test results are expected. The root partition CPU utilisation
viewed in task manager does not include child partition CPU time. Use
perfmon counters from the hypervisor VPs to view child partition CPU
counters.

You can also use the following way to determine the resource used by each
VM looking from Task Manager. From the task manager, searching from
vmms.exe and vmwp.exe and look at the resourced used by the two processes.

Vmms.exe: Both the thumbnail and machine queries are sent to the VMMS
(vmms.exe) from the the Hyper-V manager/WMI.
Vmwp.exe: this is the workprocess created for each running VM.

You can add the command line column in the task manager and see the GUID
for each worker process. Then you can find the GUID for each VM in the VM
folders on the disk. By looking at the vmwp.exe, we can identify how much
resources are allocated to the current running VM.

Also, are you looking for a traffic-generator and a performance measurement
tool? You may check this link
http://virtualizationreview.com/reports ... ialsid=958,
Iometer and Passmark may be useful in a Hyper-V stress test.
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