CPU per host, logical CPU per host and virtual CPU per core

[GnVm]

Hi,

Please let me know the differences among virtual CPU per host, logical CPU per host and virtual CPU per core. 

Regards

GNS

[hussainbte]

virtual CPU per host:Sum of all the vCPUs assigned to VMs running on a particular host. example: 10 VMs on the host with  5 vCPU each = 50 vCPU

logical CPU per host: Total CPU cores available on the ESX host along with the hyper-threaded ones. example: 6 cores/ socket 2 socket hyper-threading enabled server will have : 24 logical CPUs.

virtual CPU per core: for the above examples total vCPU/core is 50/12

[pradeepjigalur]

This is how the CPU architecture on ESXi will be

From high level to low level

SOCKET -> CORE -> vCPU

Lets assume that an  ESXi has 2 sockets and each socket has 4 cores then

a.virtual CPU per core

i. Hyper threading Enabled:  2

ii Hyper threading Disabled: 1

b. logical CPU per host and virtual CPU per host are same:

i. Hyper threading Enabled:  No. of socket * no of core * 2

                                        so in this example: 2*4*2 =16

i. Hyper threading Disabled:  No. of socket * no of core * 1

                                        so in this example: 2*4*1 =16

please find the image img.jpg for better understanding.

In the image the scenario is one where in hyper threading is enabled