[Users] Re: OpenVZ Resource Utilisation Calculator
Gus Power
gus at energizedwork.com
Wed Dec 16 05:36:51 EST 2009
Hi Aleksandar,
Thanks for your feedback.
I had a conversation with Alexander from openwall (who provided some v.useful feedback) on the same subject. The calculator uses the calculations as detailed on the OpenVZ wiki; however the underlying assumption that a virtual memory page allocation == real memory page usage seems not to apply in many circumstances; that's not to say that there isn't a relationship, it's just not 1:1 and not necessarily linear.
How do people out there calculate their utilisation in the field? Should the OpenVZ wiki be updated?
Gus.
On Wed, 16 Dec 2009 10:47:18 +0100
Aleksandar Ivanisevic <aleksandar at ivanisevic.de> wrote:
> Gus Power <gus at energizedwork.com>
> writes:
>
> > It's just a first cut; glad you liked it.
> >
> > If you have any feedback/suggestions we'd be glad to hear it.
>
>
> I think you should be using oomguarpages instead of privvmpages as the
> measure of utilization as this is the real limit that will cause
> something to be killed.
>
> Quite often I set privvmpages very high because Java JVMs like to
> allocate RAM without ever using it, so in your calculations my hosts
> look 50 times overutilized, when in fact they are nowhere near.
>
>
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--
Gus Power <gus at energizedwork.com>
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