Re: [MirageOS-devel] CPU and memory utilisation

[Thomas Leonard <talex5@xxxxxxxxx>]

Mirage should be using the CPU at 100% all the time it's not in
block_domain. main.ml emits trace events around this call:

          MProf.Trace.(note_hiatus Wait_for_work);
          block_domain timeout;
          MProf.Trace.note_resume ();

https://github.com/mirage/mirage-platform/blob/3d343935f451ba6c505e5008d2e458cf506bad8d/xen/lib/main.ml#L78

Turning on the full trace API will slow your code down quite a bit,
but you could pin a modified version of mirage-profile that captures
just these events for testing.


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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-- 
Dr Thomas Leonard        http://roscidus.com/blog/
GPG: DA98 25AE CAD0 8975 7CDA  BD8E 0713 3F96 CA74 D8BA

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