jmartuto
Contributor
Contributor

CPU Oversubsciption Ratio Question

Hello All,

I have a silly question. I am trying to calculate a 1:1 vCPU:pCPU ratio, so no CPU oversubscription.  The system has Hyperthreading enabled.

If I have a physical host with 48 physical cores and Hyperthreading is enabled, in order to use all the physical cores (but not oversubscribe), would I size the VM with 48 vCPU or 96 vCPU?

To use all 48 physical cores, I am thinking I should configure the VM with 96 vCPU. If the VM is sized with 48 vCPU, I'm only using half of the physical cores I paid for.

Please let me know. Thanks.

 

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