[one-users] Relationship of cpu usages

Christoph Pleger Christoph.Pleger at cs.tu-dortmund.de
Thu Apr 25 02:25:50 PDT 2013


> HOST/CPU is the number of cores reported by the hypervisor x 100; 800 = 8
> cpu cores.
> VM Template CPU is the number of Host CPU cores reserved for the VM. So
> cpu=0.5 means that the Host will allocate 50 from the CPU total for that
> VM.

I have a new question about that.

On http://opennebula.org/documentation:rel3.8:kvmg, I read about cgroups:

"So, thanks to cgroups a VM with CPU=0.5 will get half of the physical CPU
cycles than a VM with CPU=1.0."

How can a second VM get half of the physical CPU cycles of a first VM if
the first VM is defined to use 100 % of the CPU cycles?


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