Hmm. . it was definitely different xen virtual machines on either the same hypervisor or one that was adjacent to it in an L2 sense. On a similar environment I have set up now, I notice that the ping time from one vm to another on the same hypervisor is not noticeably less than the ping time to a vm on a different hypervisor. Not sure why that is the case! In any case it is trivial. . ~3 ms for first ping, ~0.3 ms for subsequent pings.
"Sandy Walsh" <sandy.wa...@rackspace.com> said: > Was the db on a separate server or loopback? > > On 03/23/2012 05:26 PM, Mark Washenberger wrote: >> >> >> "Johannes Erdfelt" <johan...@erdfelt.com> said: >> >>> >>> MySQL isn't exactly slow and Nova doesn't have particularly large >>> tables. It looks like the slowness is coming from the network and how >>> many queries are being made. >>> >>> Avoiding joins would mean even more queries, which looks like it would >>> slow it down even further. >>> >> >> This is exactly what I saw in my profiling. More complex queries did >> still seem to take longer than less complex ones, but it was a second >> order effect compared to the overall volume of queries. >> >> I'm not sure that network was the culprit though, since my ping >> roundtrip time was small relative to the wall time I measured for each >> nova.db.api call. >> >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~openstack >> Post to : openstack@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~openstack >> More help : https://help.launchpad.net/ListHelp > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : openstack@lists.launchpad.net > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
