openstack team mailing list archive

[Matt Joyce <matt.joyce@xxxxxxxxxxxxxxxx>]

libvirt can pull hard cpu stats.  which can be useful.  for instance it can
pick out the cpu generation names.

-matt

On Tue, May 22, 2012 at 2:32 PM, Doug Hellmann
<doug.hellmann@xxxxxxxxxxxxx>wrote:

>
>
> On Tue, May 22, 2012 at 4:35 PM, James R Penick <penick@xxxxxxxxxxxxx>wrote:
>
>> >>-> In addition to a signature, I think we would need a sequence number
>> >>to be embedded by the agent for each message sent, so that loss of
>> >>messages, or forgery of messages, can be detected by the collector and
>> >>further audit process.
>>
>> >OK. We have a message id, but I assumed those would be used to eliminate
>> >duplicates so this sounds like something different or new. It implies
>> >that the agent knows its own id (not hard) and keeps up >with a sequence
>> >counter (more difficult, though not impossible).
>> >Did you have something in mind for how to implement that?
>>
>>
>> If we're submitting messages every given node with a predictable
>> frequency, we should be able to determine that a message was lost simply
>> by noting a gap in the timestamps. Also, if we're sending cumulative
>> statistics then the loss of a single message (or even a fair number of
>> them) shouldn't impact our ability to meter too much.
>>
>
> I don't know if we have cumulative statistics. What does libvirt actually
> give us?
>
>
>>
>> -James
>>
>>
>
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