[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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