[Openstack] [ceilometer] meter data volume

Eoghan Glynn eglynn at redhat.com
Wed Oct 31 15:25:14 UTC 2012



> > I don't think (max - min) would suffice to give an accurate
> > measure of the actual CPU time used, as the counter may have
> > reset multiple times in the course of the requested duration.
> 
> It is, because /max in the API should be aware of the fact a 
> reset can occur and computes accordingly. We started to discuss
> this a bit in:
> 
>       https://bugs.launchpad.net/ceilometer/+bug/1061817

A-ha, OK, so not so much (max - min) as:

   (\Sigma local maxima) - first

Sounds computationally expensive to produce on the fly, but maybe
the local maxima can be efficiently recorded as the data is being
ingested.

Cheers,
Eoghan




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