Yes, you are right ...... :( > -----Original Message----- > From: Shawn Hartsock [mailto:hartso...@vmware.com] > Sent: Friday, November 01, 2013 8:20 AM > To: OpenStack Development Mailing List (not for usage questions) > Subject: Re: [openstack-dev] [nova][scheduler]The database access in the > scheduler filters > > > > ----- Original Message ----- > > From: "Yunhong Jiang" <yunhong.ji...@intel.com> > > To: openstack-dev@lists.openstack.org > > Sent: Thursday, October 31, 2013 6:39:29 PM > > Subject: [openstack-dev] [nova][scheduler]The database access in the > scheduler filters > > > > I noticed several filters (AggregateMultiTenancyIsoaltion, ram_filter, > > type_filter, AggregateInstanceExtraSpecsFilter) have DB access in the > > host_passes(). Some will even access for each invocation. > > > > Just curios if this is considered a performance issue? With a 10k nodes, > 60 > > VM per node, and 3 hours VM life cycle cloud, it will have more than 1 > > million DB access per second. Not a small number IMHO. > > > > Thanks > > --jyh > > > > _______________________________________________ > > OpenStack-dev mailing list > > OpenStack-dev@lists.openstack.org > > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > > > Sorry if I'm dumb, but please try to explain things to me. I don't think I > follow... > > 10k nodes, 60 VM per node... is 600k VM in the whole cloud. A 3 hour life > cycle for a VM means every hour 1/3 the nodes turn over so 200k VM > are created/deleted per hour ... divide by 60 for ... 3,333.333 per minute > or ... divide by 60 for ... 55.5 VM creations/deletions per second ... > > ... did I do that math right? So where's the million DB accesses per second > come from? Are the rules fired for every VM on every access so that 600k > VM + 1 new VM means the rules fire 600k + 1 times? What? Sorry... really > confused. > > # Shawn Hartsock > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
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