openstack team mailing list archive

[Hunter Nield <hnield@xxxxxxxxxxxxx>]

We ran into the same issue and ended up having to patch in support for per
host reserved cores. We've not had a chance to submit a patch for it.

I'm wondering if this addition to Folsom will provide similar functionality
- https://blueprints.launchpad.net/nova/+spec/libvirt-xml-cpu-model. I need
to look at the blueprint and commits in further detail.

Hunter

On Mon, Sep 3, 2012 at 11:02 PM, John Griffith
<john.griffith@xxxxxxxxxxxxx>wrote:

>
>
> On Mon, Sep 3, 2012 at 7:57 AM, Alex Glikson <GLIKSON@xxxxxxxxxx> wrote:
>
>> Dear all,
>>
>> I wonder whether there is an easy way to configure how many cores
>> nova-compute is supposed to use (or alternatively refrain from using) for
>> provisioning of instances on a certain host, out of the total number of
>> cores on that host? E.g., if I know that there are other things running on
>> the host, and I want to dedicate some of the CPU capacity to them (such as
>> OpenStack services themselves). I am thinking of KVM right now, but the
>> general approach is probably platform-independent. Would appreciate your
>> insights.
>>
>> Thanks,
>> Alex
>>
>> P.S. trivial solution is to dedicate entire host(s) to those other
>> "things", and assume that nova-compute is running on hosts used *only* to
>> run VMs (and that nova-compute itself does not need much CPU cycles). but I
>> am looking for a more fine-grained approach.
>>
>>
>> ====================================================================================================
>> Alex Glikson
>> Manager, Cloud Operating System Technologies, IBM Haifa Research Lab
>> http://w3.haifa.ibm.com/dept/stt/cloud_sys.html |
>> https://www.research.ibm.com/haifa/dept/stt/cloud_sys.shtml
>> Email: glikson@xxxxxxxxxx | Phone: +972-4-8281085 | Mobile:
>> +972-54-6466667 | Fax: +972-4-8296112
>>
>> _______________________________________________
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>>
>> Hi Alex,
>
> You might have a look at the max_cores setting in your nova.conf file.  I
> think this will do what you have in mind.  You can find some documentation
> on it here:
>
> http://docs.openstack.org/essex/openstack-compute/admin/content/compute-options-reference.html<http://docs.openstack.org/trunk/openstack-compute/admin/content/compute-options-reference.html>
>
> John
>
> _______________________________________________
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>


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Senior Director of Development
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