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From Bharat Kumar <bharat.ku...@citrix.com>
Subject Re: cpu overprovisioning
Date Wed, 22 Apr 2015 04:20:07 GMT
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
gentilmente comunicazione.
Per qualsiasi informazione si prega di contattare support@procne.it<mailto:support@procne.it>
.
Rif. D.L. 196/2003





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