Open Stack

Yes, you are right ...... :(

> -----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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