vCPU vs Physical CPU
How does OpenStack/KVM set the number of vCPUs based on the physical CPU on the physical machine?
In my case, I have two different model of Intel CPU, Xeon E5645 and Xeon E5-2690 for my compute-node servers:
I checked Intel website, there is 6 cores in Xeon E5645 while Xeon E5-2690 has 8 cores.
In the 'compute_nodes' table, it shows that there are 12 vCPU for the machine with Xeon E5645; whereas there are 16 vCPU in Xeon E5-2690.
--> It seems that the ratio is 1:2
How does it calculate?
Can I adjust it?
Please rephrase the title into a question.
what do you suggest? I have no idea!