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From Bharat Kumar <bharat.ku...@citrix.com>
Subject Re: cpu overprovisioning
Date Wed, 22 Apr 2015 04:26:27 GMT
Also In case of change in the overcommit value the total capacity will change instantaneously,
but the used resource and the total available will change when
the capacity checker thread runs. The interval at which this will run can be changed from
the global settings.

Thanks,
Bharat.

On 22-Apr-2015, at 9:50 am, Bharat Kumar <bharat.kumar@citrix.com> wrote:

> Hi,
> 
> The change in cpu overcommit factor will not change the amount of resource that are available
to you. It will change the way you want to use the free resource available at that time. It
won’t change
> what was already allocated.
> 
> for example if you have deployed the VMs with overcommit say 2  and after a while you
change the overcommit to 3, the used resource will be scaled based on the change.
> changing the overcommit cannot create resource. It can only change the way you want to
use the free resource.  So now after the change in overcommit you can deploy 3 times more
VMs (of
> a given service offering) than usual using the the resource that is free at the time
of changing the overcommit value. The perviously allocated resource cannot be freed until
you
> restart the VMs.
> 
> This link will tell you how resource allocation calculations are made.
> https://cwiki.apache.org/confluence/display/CLOUDSTACK/CPU+and+RAM+Overcommit
> 
> Thanks,
> Bharat.
> 
> 
> On 21-Apr-2015, at 11:20 pm, Rafael Weingärtner <rafaelweingartner@gmail.com<mailto:rafaelweingartner@gmail.com>>
wrote:
> 
> I have not looked at the code, but that seems odd.
> Restarting VMs instances to update the resource usage/resource availability
> when changing the overprovisioning factor.
> 
> On Tue, Apr 21, 2015 at 12:51 PM, S. Brüseke - proIO GmbH <
> s.brueseke@proio.com<mailto:s.brueseke@proio.com>> wrote:
> 
> Please try to stop and start the vm. Maybe reboot is not working here. You
> should start to see more free CPU after the first vm.
> 
> Mit freundlichen Grüßen / With kind regards,
> 
> Swen Brüseke
> 
> -----Ursprüngliche Nachricht-----
> Von: Ugo Vasi [mailto:ugo.vasi@procne.it]
> Gesendet: Dienstag, 21. April 2015 16:40
> An: users@cloudstack.apache.org<mailto:users@cloudstack.apache.org>
> Betreff: Re: AW: cpu overprovisioning
> 
> Hi Swen,
> I try rebboting 2 vm but the amount of cpu MHz is not changed. Do I have
> to restart all vm before you see a change?
> 
> 
> Il 21/04/2015 16:16, S. Brüseke - proIO GmbH ha scritto:
> This is because the factor of overprovisioning is attached to the
> instance too! And this factor is only changing after rebooting the instance.
> So after a change of cpu.overprovisioning.factor you need to reboot all
> instances on this cluster which were running before this change was made.
> 
> Mit freundlichen Grüßen / With kind regards,
> 
> Swen Brüseke
> 
> -----Ursprüngliche Nachricht-----
> Von: Ugo Vasi [mailto:ugo.vasi@procne.it]
> Gesendet: Dienstag, 21. April 2015 16:06
> An: users@cloudstack.apache.org<mailto:users@cloudstack.apache.org>
> Betreff: Re: cpu overprovisioning
> 
> If I change the over-provisioning ratio in cluster-relative settings
> (infrastructure->cluser->cluster-name->settings) the dashboard show the
> sum of real GHz the overprovisioned amount of GHz (324GHz) as aspected, but
> after a while also the sum of Ghz is multiplied by the same factor making
> it unnecessary...
> 
> Il 21/04/2015 15:26, Bharat Kumar ha scritto:
> In case of cloudstack, cpu capacity for host is total of cpus * no of
> Ghz * overporvisoning.
> 
> total capacity = sum of capacities of individual hosts.
> 
> Thanks,
> Bharat.
> 
> On 21-Apr-2015, at 6:49 pm, Abhinandan Prateek <
> abhinandan.prateek@shapeblue.com<mailto:abhinandan.prateek@shapeblue.com>> wrote:
> 
> Available CPU will be 3 times the actual CPU when over provisioned by
> 3.
> 
> The UI not showing the over provisioned value seems like a bug.
> 
> -abhi
> 
> 
> On 21-Apr-2015, at 6:34 pm, Ugo Vasi <ugo.vasi@procne.it<mailto:ugo.vasi@procne.it>>
wrote:
> 
> Hi all,
> we have a cluster of three machines with 16 CPU at 2.2GHz each and we
> have set a cpu-overprovizioning to 3.
> 
> I would expect that the CPU system capacity of the dashboard appear
> with the sum of megahertz CPUs multiplied by three instead I get the real
> sum (108MHz).
> 
> I do not understand if this overprovisioning allows me to allocate
> more MHz of real ones asthe documentation say since in reality the virtual
> machines occupy on average only 20% of the computing power.
> 
> thanks in advance
> 
> --
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> --
> 
>  U g o   V a s i    <ugo.vasi@procne.it<mailto:ugo.vasi@procne.it>>
>  P r o c n e  s.r.l    >)
>  via Cotonificio 45  33010 Tavagnacco IT
>  phone: +390432486523 fax: +390432486523
> 
> Le informazioni contenute in questo messaggio sono riservate e
> confidenziali ed è vietata la diffusione in qualunque modo eseguita.
> Qualora Lei non fosse la persona a cui il presente messaggio è
> destinato, La invitiamo ad eliminarlo e a non leggerlo, dandocene
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.
> Rif. D.L. 196/2003
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> 
> 
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> --
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