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Posted to users@cloudstack.apache.org by Asai <as...@globalchangemusic.org> on 2018/12/13 20:14:40 UTC
Resource Allocation Question
Greetings,
I have a simple question regarding Cloudstack resource allocation.
In the dashboard, I’m seeing that our Memory is 25 out of 30 GB and the circle is colored red. # of CPUs is 20 out of 24 and is colored red. But CPU is 33 GHz out of 76 GHz. We have a single Xeon E5-2620 v3 @ 2.40GHz. This is a 4 core / 8 thread CPU. How is that we have 76 GHz available? It seems like we’d have around 57 or so GHz available.
Thanks for your assistance.
Asai
Re: Resource Allocation Question
Posted by Andrija Panic <an...@gmail.com>.
Hi Asai,
you have 3 servers of 8 cores @ 2.4GHz - but your turbo boost frequency is
3.2 GHZ (
https://ark.intel.com/products/83352/Intel-Xeon-Processor-E5-2620-v3-15M-Cache-2-40-GHz-)
and for unknown reason, this Turbo Boost frequency is what ACS sees - but
that only means, say 30% effective over-provisioning of CPU - not issues in
other things at all !
Your total CPU/MHz math looks like this: 3 servers x 8 cores (HT) x 3.2GHZ
= 24 x 3.2GHz = 76.8 GHz - so the math is clear :)
You should be able to use up to "
cluster.cpu.allocated.capacity.disablethreshold " as percentage of your
total CPU/GHz - which by default (unless I'm wrong) 0.8, meaning 80% of
your total CPU/MHz = 0.8 x 76.8GHz = 61.44 GHz... Whatever is the color on
Dashboard - you should be able to use up to total of 61.44 GHz really -
after that you will receive error about "Insufficient Capacity..."
There is lower threshold used just to notify you
"cluster.cpu.allocated.capacity.notificationthreshold" when you are close
to limit... (you get email only once !)
These 2 thresholds can be set as part of Global Settings (requires MGMT
server restart afterwards) - or you can set it on the Cluster level (no
need for MGMT restart)
You can also set CPU over-provisioning as neeeded, for testing purposes,
say to 3.0 so you ACS will see 300% of your real GHz = 230.4 GHz
Hope that makes sense.
NOTE: one thing that I see perhaps confuses you - in Compute Offerings, you
define number of CPU cores (say, 4 cores), but also a speed of each CPU
core (say, 2.0 GHz), instead of real core frequency = this means your VM
will effectively be allocated 4 cores x 2.0GHz = 8GHz. So this means that
your whole cluster (but also a host which will be chosen eventually) needs
to have at least 8GHz free/available in order to successfully deploy VM.
So forget about real number of cores vs. virtual cores (as part of Compute
Offering) - better observe only GHz (Dashboard does display only GHz not
number of Cores, afaik?)
Cheers
Andrija
On Tue, 18 Dec 2018 at 18:56, Asai <as...@globalchangemusic.org> wrote:
> Thank you for your response.
>
> So, is there any way we can take advantage of the processor speed that
> doesn’t seem to be allocated? We’re not clear on how this works. It seems
> like there’s a tremendous amount of underutilization here? Although we
> have allocated 20 out of 24 cores, it seems like we’re not able to access
> the resources the processors like they should be able to be.
>
> What are we missing here?
>
> > On Dec 13, 2018, at 2:27 PM, Andrija Panic <an...@gmail.com>
> wrote:
> >
> > In my case, hyperthreading number of cores (whatever OS sees as number of
> > cores) times the TurboBoost GHZ is what I get, so for 2x8 cored 2.6Ghz
> (32
> > cores with hyperthreading) I get 32 x 3.4 Ghz, which is not what you can
> > achieve at any time (that frequency can be obtained on only very few
> cores
> > at any moment, not nearly all cores).
> >
> > Go to Host in GUI and check its statistics, you will see - take into
> > account any overprovisioning applied....
> >
> > Cheers
> >
> > On Thu, Dec 13, 2018, 20:19 Rafael Weingärtner <
> rafaelweingartner@gmail.com
> > wrote:
> >
> >> You have a four core CPU, with 8 threads each? Then, each thread is 2.4
> >> GHz. So, 2.4 * 4 * 8.
> >>
> >> On Thu, Dec 13, 2018 at 6:14 PM Asai <as...@globalchangemusic.org>
> wrote:
> >>
> >>> Greetings,
> >>>
> >>> I have a simple question regarding Cloudstack resource allocation.
> >>>
> >>> In the dashboard, I’m seeing that our Memory is 25 out of 30 GB and the
> >>> circle is colored red. # of CPUs is 20 out of 24 and is colored red.
> >> But
> >>> CPU is 33 GHz out of 76 GHz. We have a single Xeon E5-2620 v3 @
> 2.40GHz.
> >>> This is a 4 core / 8 thread CPU. How is that we have 76 GHz available?
> >> It
> >>> seems like we’d have around 57 or so GHz available.
> >>>
> >>> Thanks for your assistance.
> >>>
> >>> Asai
> >>>
> >>>
> >>>
> >>
> >> --
> >> Rafael Weingärtner
> >>
>
>
--
Andrija Panić
Re: Resource Allocation Question
Posted by Asai <as...@globalchangemusic.org>.
Thank you for your response.
So, is there any way we can take advantage of the processor speed that doesn’t seem to be allocated? We’re not clear on how this works. It seems like there’s a tremendous amount of underutilization here? Although we have allocated 20 out of 24 cores, it seems like we’re not able to access the resources the processors like they should be able to be.
What are we missing here?
> On Dec 13, 2018, at 2:27 PM, Andrija Panic <an...@gmail.com> wrote:
>
> In my case, hyperthreading number of cores (whatever OS sees as number of
> cores) times the TurboBoost GHZ is what I get, so for 2x8 cored 2.6Ghz (32
> cores with hyperthreading) I get 32 x 3.4 Ghz, which is not what you can
> achieve at any time (that frequency can be obtained on only very few cores
> at any moment, not nearly all cores).
>
> Go to Host in GUI and check its statistics, you will see - take into
> account any overprovisioning applied....
>
> Cheers
>
> On Thu, Dec 13, 2018, 20:19 Rafael Weingärtner <rafaelweingartner@gmail.com
> wrote:
>
>> You have a four core CPU, with 8 threads each? Then, each thread is 2.4
>> GHz. So, 2.4 * 4 * 8.
>>
>> On Thu, Dec 13, 2018 at 6:14 PM Asai <as...@globalchangemusic.org> wrote:
>>
>>> Greetings,
>>>
>>> I have a simple question regarding Cloudstack resource allocation.
>>>
>>> In the dashboard, I’m seeing that our Memory is 25 out of 30 GB and the
>>> circle is colored red. # of CPUs is 20 out of 24 and is colored red.
>> But
>>> CPU is 33 GHz out of 76 GHz. We have a single Xeon E5-2620 v3 @ 2.40GHz.
>>> This is a 4 core / 8 thread CPU. How is that we have 76 GHz available?
>> It
>>> seems like we’d have around 57 or so GHz available.
>>>
>>> Thanks for your assistance.
>>>
>>> Asai
>>>
>>>
>>>
>>
>> --
>> Rafael Weingärtner
>>
Re: Resource Allocation Question
Posted by Andrija Panic <an...@gmail.com>.
In my case, hyperthreading number of cores (whatever OS sees as number of
cores) times the TurboBoost GHZ is what I get, so for 2x8 cored 2.6Ghz (32
cores with hyperthreading) I get 32 x 3.4 Ghz, which is not what you can
achieve at any time (that frequency can be obtained on only very few cores
at any moment, not nearly all cores).
Go to Host in GUI and check its statistics, you will see - take into
account any overprovisioning applied....
Cheers
On Thu, Dec 13, 2018, 20:19 Rafael Weingärtner <rafaelweingartner@gmail.com
wrote:
> You have a four core CPU, with 8 threads each? Then, each thread is 2.4
> GHz. So, 2.4 * 4 * 8.
>
> On Thu, Dec 13, 2018 at 6:14 PM Asai <as...@globalchangemusic.org> wrote:
>
> > Greetings,
> >
> > I have a simple question regarding Cloudstack resource allocation.
> >
> > In the dashboard, I’m seeing that our Memory is 25 out of 30 GB and the
> > circle is colored red. # of CPUs is 20 out of 24 and is colored red.
> But
> > CPU is 33 GHz out of 76 GHz. We have a single Xeon E5-2620 v3 @ 2.40GHz.
> > This is a 4 core / 8 thread CPU. How is that we have 76 GHz available?
> It
> > seems like we’d have around 57 or so GHz available.
> >
> > Thanks for your assistance.
> >
> > Asai
> >
> >
> >
>
> --
> Rafael Weingärtner
>
Re: Resource Allocation Question
Posted by Rafael Weingärtner <ra...@gmail.com>.
You have a four core CPU, with 8 threads each? Then, each thread is 2.4
GHz. So, 2.4 * 4 * 8.
On Thu, Dec 13, 2018 at 6:14 PM Asai <as...@globalchangemusic.org> wrote:
> Greetings,
>
> I have a simple question regarding Cloudstack resource allocation.
>
> In the dashboard, I’m seeing that our Memory is 25 out of 30 GB and the
> circle is colored red. # of CPUs is 20 out of 24 and is colored red. But
> CPU is 33 GHz out of 76 GHz. We have a single Xeon E5-2620 v3 @ 2.40GHz.
> This is a 4 core / 8 thread CPU. How is that we have 76 GHz available? It
> seems like we’d have around 57 or so GHz available.
>
> Thanks for your assistance.
>
> Asai
>
>
>
--
Rafael Weingärtner