Andy Zhou <az...@ovn.org> wrote on 02/08/2016 01:54:06 PM:
> From: Andy Zhou <az...@ovn.org> > To: Ryan Moats/Omaha/IBM@IBMUS > Cc: discuss@openvswitch.org > Date: 02/08/2016 01:54 PM > Subject: Re: [ovs-discuss] Some more scaling test results... > > On Fri, Feb 5, 2016 at 5:26 PM, Ryan Moats <rmo...@us.ibm.com> wrote: > Today, I stood up a five node openstack cloud on machines with 56 > cores and 256GB of memory and ran a scaling test to see if I could > stamp out 8000 copies of the following pattern in a single project > (tenant): n1 --- r1 --- n2 (in other words, create 8000 routers, > 16000 networks, 16000 subnets, and 32000 ports). Since both n1 and > n2 had subnets that were configured to use DHCP, the controller has > 16000 namespaces and dnsmasq processes. The controller was set up to > use separate processes to handle the OVN NB DB, OVN SB DB, and > Openvswitch DBs > > So, what happened? > > The neutron log (q-svc.log) showed zero OVS DB timeouts, which means > that the ovsdb server process handling the NB OVN db could keep up > with the scale test. Looking at the server at the end of the > experiment, it was using about 70GB of memory, with the top twenty > occupancies being: > > ovsdb-server process handling the OVN SB db at 25G > ovsdb-server process handling the vswitch DB at 2.7G > ovn-controller process at 879M > each of the 17 neutron-server processes at around 825M > (this totals up to slightly more than 42.5G) > > For those interested, the OVSDB file sizes on disk are 138M for > ovnsb.db, 14.9M for ovnnb.db and 18.4M for conf.db > > Although I admit that this test didn't include the stress that > putting a bunch of ports onto a single network would create, but > still, I'm of the belief that if one uses separate ovsdb-server > processes, then the long poles in the tent become the SB OVN > database and the processes that are driven by it. > > Have a great weekend, > Ryan > > Thanks for sharing. > > May I know how many connections do ovsdb-server SB host? On a live > system, you can find out by typing: "ovs-appctl -t ovsdb-server memory/show" Unfortunately, the experiment has been torn down to allow others to run, so I can no longer provide that information...
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