Tim, yep. If you use one db for Ceilometer and Nova then nova's performance may be affected. I've seen this issue. Will start profiling ASAP.
On Thu, Mar 20, 2014 at 3:59 PM, Tim Bell <tim.b...@cern.ch> wrote: > > +1 for performance analysis to understand what needs to be optimised. > Metering should be light-weight. > > For those of us running in production, we don't have an option to turn > ceilometer off some of the time. That we are not able to run through the > gate tests hints that there are optimisations that are needed. > > For example, turning on ceilometer caused a 16x increase in our Nova API > call rate, see > http://openstack-in-production.blogspot.ch/2014/03/cern-cloud-architecture-update-for.htmlfor > details. > > Tim > > > -----Original Message----- > > From: Sean Dague [mailto:s...@dague.net] > > Sent: 20 March 2014 11:16 > > To: OpenStack Development Mailing List (not for usage questions) > > Subject: Re: [openstack-dev] [Ceilometer][QA][Tempest][Infra] Ceilometer > tempest testing in gate > > > ... > > > > While I agree that Tempest's job is not to test performance, we do have > to give some basic sanity checking here that the software is running in some > > performance profile that we believe is base usable. > > > > Based on the latest dstat results, I think that's a dubious assessment. > > The answer on the collector side has to be something other than > horizontal scaling. Because we're talking about the collector being the 3rd > highest > > utilized process on the box right now (we should write a dstat plugin to > give us cumulative data, just haven't gotten there yet). > > > > So right now, I think performance analysis for ceilometer on sqla is > important, really important. Not just horizontal scaling, but actual > > performance profiling. > > > > -Sean > > > > -- > > Sean Dague > > Samsung Research America > > s...@dague.net / sean.da...@samsung.com > > http://dague.net > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev >
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