VMware vSphere

Hello,

for example - if we need 6 vcpu, we can do it in four different ways:

Sockets/CoresPerSocket

1/6

2/3

3/2

6/1

which way is better in terms of performance?

They are all equal*.  What was the reason to ask?

Regards,
Joerg

* As long as you stay within a numa node. Even when not.... it depends... take a look to How ESXi NUMA Scheduling Works

You can find discussions, and blog posts regarding how vCPU configurations affects NUMA, which may play a role in large, high performance environments.

However, in most cases this configuration depends on the operating system's, and running application's capabilities. Some operating systems, or applications may not support a high number of vCPUs, in which case it may make sense to configure Cores-per-socket.

André

I would recommend reading:

• vCPU configuration. Performance impact between virtual sockets and virtual cores? - frankdenneman.nl​
• https://frankdenneman.nl/2016/12/12/decoupling-cores-per-socket-virtual-numa-topology-vsphere-6-5/
• Virtual Machine vCPU and vNUMA Rightsizing - Rules of Thumb - VMware VROOM! Performance Blog

form a performance perspective they would all be the same

From a licensing perspective, depends on how your vendor works

Since vsphere 6.5 the esxi host makes all the vNUMA calculations.

Please chekc this for more information: Virtual Machine vCPU and vNUMA Rightsizing - Rules of Thumb - VMware VROOM! Performance Blog