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Ivan,

see if it provides an answer:
https://ask.openstack.org/en/question/55307/overcommitting-value-in-novaconf/

Regards,
Eugene.

On Wed, Jan 11, 2017 at 1:55 PM, James Downs <egon at egon.cc> wrote:

> On Wed, Jan 11, 2017 at 09:34:32PM +0000, Ivan Derbenev wrote:
>
> > if both vms start using all 64gb memory, both of them start using swap
>
> Don't overcommit RAM.
>
> > So, the question is - is it possible to prioritize 1st vm above 2nd? so
> the second one will fail before the 1st, to leave maximum possible
> perfomance to the most importan one?
>
> Do you mean CPU prioritization? There are facilities to allow one VM or
> another to have CPU priority, but what, if a high priority VM wants RAM,
> you want to OOM the other? That doesn't exist, AFAIK.
>
> Cheers,
> -j
>
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