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Re: number of cores


Thx Dag for confirmation.

Speaking about CPU cores - I do have one "problem" which not sure is
possible to solve in meaningful way

2 x 8 core Intel Xeon E5 2.6GHz nominally (with HT enabled), with burst to
3.4 GHz ( but ! only a few cores can burst to that 3.4 - not all at the
same time !) -  and CloudStack reports my host as 32 x 3.4GHz (instead of
32 x 2.6 GHz)
(not sure from where does ACS extract this 3.4GHz info... - effectively my
host CPUs are overprovisioned here by 3.4 / 2.6 = 1.30 (30%
overprovisioning)

One note, we do have CPU governor set to high performance etc...

Any opinion ?

Cheers

On Mon, 19 Nov 2018 at 16:10, Dag Sonstebo <Dag.Sonstebo@xxxxxxxxxxxxx>
wrote:

> Ultimately there will always be a 1-to-1 relationship between vCPU cores
> and physical cores - you can't make a 4vCPU VM run on an "overprovisioned 2
> physical core" hypervisor (unless you consider Intel HT to be exactly
> this). You can only overprovision time slices of your total clock cycles.
> If you push the limits too far on this though you get vCPU wait times -
> when there is too much contention and it ends up taking too long to
> schedule e.g. 4 vCPUs on 4 physical cores.
>
> IMO having the total number of cores is still useful information - same as
> total number of hosts and memory. Yes we know these are total numbers - but
> still gives you an idea of the capacity of your compute nodes.
>
> Regards,
> Dag Sonstebo
> Cloud Architect
> ShapeBlue
>
>
> On 19/11/2018, 14:43, "Andrija Panic" <andrija.panic@xxxxxxxxx> wrote:
>
>     Unless someone gives you better answer, I guess it's for fun - to have
> more
>     detailed numbers in dashboard (may be it's related to other hypervisor
>     types, just assuming... or not...)
>
>     Cheers
>
>
> Dag.Sonstebo@xxxxxxxxxxxxx
> www.shapeblue.com
> Amadeus House, Floral Street, London  WC2E 9DPUK
> @shapeblue
>
>
>
> On Mon, 19 Nov 2018 at 14:11, Ugo Vasi <ugo.vasi@xxxxxxxxx> wrote:
>
>     > Hi Andrija,
>     > not having noticed this new voice before I wondered if it is limiting
>     > the fact of reaching or exceeding the number of physical cores.
>     >
>     > What is the purpose of this dashboard pane?
>     >
>     >
>     > Il 19/11/18 12:56, Andrija Panic ha scritto:
>     > > Hi Ugo,
>     > >
>     > > Why would you want to do this, just curious ?
>     > >
>     > > I believe it's not possible, but anyway (at least with KVM,
> probably same
>     > > for other hypervisors) it doesn't even makes sense/use, since when
>     > > deploying a VM, ACS query host free/unused number of MHz (GHz), so
> it's
>     > not
>     > > even relevant for ACS - number of cores in not relevant in ACS
>     > calculations
>     > > during VM deployment.
>     > >
>     > >
>     > > Cheers,
>     > > Andrija
>     > >
>     > > On Mon, Nov 19, 2018, 11:31 Ugo Vasi <ugo.vasi@xxxxxxxxx.invalid
> wrote:
>     > >
>     > >> Hi all,
>     > >> in the dashboard of an ACS installation vesion 4.11.1.0 (Ubuntu
> 16.04
>     > >> with KVM hypervisor), the new entry "# of CPU Cores" appears.
>     > >> Is it possible to over-provision like for MHz or storage?
>     > >>
>     > >> Thanks
>     > >>
>     > >>
>     > >> --
>     > >>
>     > >> *Ugo Vasi* / System Administrator
>     > >> ugo.vasi@xxxxxxxxx <mailto:ugo.vasi@xxxxxxxxx>
>     > >>
>     > >>
>     > >>
>     > >>
>     > >> *Procne S.r.l.*
>     > >> +39 0432 486 523
>     > >> via Cotonificio, 45
>     > >> 33010 Tavagnacco (UD)
>     > >> www.procne.it <http://www.procne.it/>
>     > >>
>     > >>
>     > >> Le informazioni contenute nella presente comunicazione ed i
> relativi
>     > >> allegati possono essere riservate e sono, comunque, destinate
>     > >> esclusivamente alle persone od alla Società sopraindicati. La
>     > >> diffusione, distribuzione e/o copiatura del documento trasmesso
> da parte
>     > >> di qualsiasi soggetto diverso dal destinatario è proibita sia ai
> sensi
>     > >> dell'art. 616 c.p., che ai sensi del Decreto Legislativo n.
> 196/2003
>     > >> "Codice in materia di protezione dei dati personali". Se avete
> ricevuto
>     > >> questo messaggio per errore, vi preghiamo di distruggerlo e di
> informare
>     > >> immediatamente Procne S.r.l. scrivendo all' indirizzo e-mail
>     > >> info@xxxxxxxxx <mailto:info@xxxxxxxxx>.
>     > >>
>     > >>
>     > >
>     > >
>     > >
>     >
>     >
>     > --
>     >
>     > *Ugo Vasi* / System Administrator
>     > ugo.vasi@xxxxxxxxx <mailto:ugo.vasi@xxxxxxxxx>
>     >
>     >
>     >
>     >
>     > *Procne S.r.l.*
>     > +39 0432 486 523
>     > via Cotonificio, 45
>     > 33010 Tavagnacco (UD)
>     > www.procne.it <http://www.procne.it/>
>     >
>     >
>     > Le informazioni contenute nella presente comunicazione ed i relativi
>     > allegati possono essere riservate e sono, comunque, destinate
>     > esclusivamente alle persone od alla Società sopraindicati. La
>     > diffusione, distribuzione e/o copiatura del documento trasmesso da
> parte
>     > di qualsiasi soggetto diverso dal destinatario è proibita sia ai
> sensi
>     > dell'art. 616 c.p., che ai sensi del Decreto Legislativo n. 196/2003
>     > "Codice in materia di protezione dei dati personali". Se avete
> ricevuto
>     > questo messaggio per errore, vi preghiamo di distruggerlo e di
> informare
>     > immediatamente Procne S.r.l. scrivendo all' indirizzo e-mail
>     > info@xxxxxxxxx <mailto:info@xxxxxxxxx>.
>     >
>     >
>
>     --
>
>     Andrija Panić
>
>
>

-- 

Andrija Panić