Only VM saturate a host

I have a host with two processors Intel E5-2430 (taken 2, 6 cores) with Hyper Threading enabled for a total of 24 logical processors. One of the virtual machine that we deployed was configured with 12 vCPU (Jack 2, core 6). During our evaluation of performance tests, I noticed that this VM consumed all available on the host processor cycles. With HT active, shouldn't it use only half of the available resources?

The physical ESX host CPU utilization is made by planning the vCPUs spread over all the physical processors.

General recommendation is to keep 1 core per socket and give 12 vCPUs, until and unless special requirements.

Also if a vCPU 12 virtual machine is intensive CPU it uses all the physical processors 12 on ESXi. Please check if there are any other powered on virtual machines on the same host and move them to another box.

Tags: VMware

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