On Tue, Feb 15, 2011 at 10:17 PM, Martin Pool <[email protected]> wrote: > One interesting thing I discovered today, while working on > https://launchpad.net/kanban/, is that the overall time to draw the > kanban is quite consistently like 30% greater (slower) talking to > lpnet than to edge. So, the sooner the edge hardware can be folded > into lpnet, the better.
The reason for this is different queues in the datacentre: edge has between 6 and 8 requests active on each appserver at once; lpnet has 7-10. But both appservers are only configured to run 4 requests concurrently: those additional requests queue. This is likely self limiting at the moment: the user population doesn't push new requests until their prior one completes. We have 8 cores we could reconfigure too as soon as the losas have some time; behind that we have 12 additional cores coming in new machines; these should let us support the active users more directly, though it may not be sufficient - we'll see how we go. We're also reconfiguring to make the queuing fairer: rather than queuing on each appserver we're going to queue in haproxy, so requests will go to the first available service point, rather than potentially getting stuck behind 4 bug searches on one appserver. This should eliminate a lot of the sporadic nature of the delays (but won't intrinsically remove them). -Rob _______________________________________________ Mailing list: https://launchpad.net/~launchpad-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~launchpad-dev More help : https://help.launchpad.net/ListHelp
