Re: [MirageOS-devel] CPU and memory utilisation

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

There's currently no way to get CPU information from within the unikernel;
adding this via Rump Kernels may be the way to go -- Martin, are there perf
hooks within rumpxen at the moment?

Another easy way to make this work within the unikernel is by running an agent
on dom0 that regularly writes CPU stats into Xenstore to make them available
to the unikernel VM. In fact, I wonder if the XAPI toolstack already does this
for the guest agent (or if it works the other way around).  Dave, Jon?

-anil

> On 19 May 2015, at 09:49, Masoud Koleini <masoud.koleini@xxxxxxxxxxxxxxxx> 
> wrote:
> 
> Hi Anil and Mindy,
> 
> Thank you for the information and the link.
> 
> I am trying to get CPU utilisation from *within* the unikernel.
> 
> 
> On 18/05/15 19:47, Anil Madhavapeddy wrote:
>> Hi Masoud,
>> 
>> The CPU utilisation is most easily done from the outside by using "xentop"
>> or similar tools to gather the virtual machine utilisation.  The unikernel
>> will just be sitting blocked when there's no IO, so this is accurate.
>> 
>> Memory can be obtained via the OCaml GC module; Mindy's reply has a link
>> to the easy way to use it to generate HTML.
>> 
>> A more subtle question: are you trying to get this information from *within*
>> the unikernel to alter its behaviour in response to load?  In that case 
>> you'll
>> need a slightly more sophisticated way to measure CPU usage from within the
>> VM.
>> 
>> -anil
>> 
>>> On 18 May 2015, at 10:56, Masoud Koleini <masoud.koleini@xxxxxxxxxxxxxxxx> 
>>> wrote:
>>> 
>>> Hi all,
>>> 
>>> Is the any way for a Mirage unikernel to get its CPU and memory utilisation?
>>> 
>>> Thanks.
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
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> 
> 
> 
> 
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