marius1
Enthusiast
Enthusiast
‎01-05-2022 05:49 AM

vCPUs and cores

When creating a new VM I can set the number of vCPUs and cores.
Given the numver of sockets I can assign to a given VM (let's say, 4), which is the best practice for a Windows Server VM?

  • 2 vCPUs with 2 cores each?
  • 4 vCPUs with core each one?
  • 1 vCPU with 4 cores?

Is it the same for Linux based guests?
marius

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vbondzio
VMware Employee
VMware Employee
‎01-05-2022 07:15 AM

As many cores per socket as necessary to replicate the underlying HW the vCPUs are scheduled on, that usually means as many cores (or threads) as are in a socket / NUMA node (depending on VM / HW size).

Longer explanation here: https://communities.vmware.com/t5/ESXi-Discussions/cores-vs-sockets-disks-vs-controllers/m-p/2829364...

Yes, same for Linux guests (even more so since Linux is using a relationship scheduler that takes that information into account).

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