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Shawn, yes, there is 56 VM access every second, and for each VM access, the scheduler will invoke filter for each host, that means, for each VM access, the filter function will be invoked 10k times.
So 56 * 10k = 560k, yes, half of 1M, but still big number.

--jyh

> -----Original Message-----
> From: Shawn Hartsock [mailto:hartsocks at 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.jiang at intel.com>
> > To: openstack-dev at 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 at 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
> 
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