Hi! On Wed, Sep 20, 2006 at 11:18:53AM +0100, Paul Butcher wrote: > We have been searching for a Rails deployment architecture which works for > us for some time. We've recently moved from Apache 1.3 + FastCGI to Apache > 2.2 + mod_proxy_balancer + mongrel_cluster, and it's a significant > improvement. But it still exhibits serious performance problems.
hey, cool, I really like the simplicity of your approach. However I tried to solve your problem with Pen, and here's what I got: standard pen setup, no special options besides 'no sticky sessions' and 'non blocking mode': pen -fndr 9000 localhost:9001 localhost:9002 Fast: 13 Slow: 6 just as predicted by you. However, if I limit *one* of the mongrels to 1 connection at a time, I get this: pen -fdnr 9000 localhost:9001:1 localhost:9002 Fast: 59 Slow: 6 When I limit both backend servers to only 1 connection the test script always bails out since pen doesn't seem to keep connections like you do in your queue, but closes them if it finds no server to dispatch to, so it needs at least one backend process to pile up connections at when the need arises. I have no idea if this is a solution that would be useful under real life conditions, but found the behaviour quite interesting. I also raised the number of threads requesting the fast action, which led to more successful requests on the fast action, and (sometimes) less on the slow one, i.e. Fast: 67-69 Slow: 5-6 with 10 threads accessing the fast action. Whatever load balancing you use, you'll always need to have more Mongrels than there are concurrent requests for 'slow' actions to avoid delays for clients requesting a 'fast' action. So maybe, if the slow actions are well known, one could just reserve a pool of Mongrels for these slow actions, and another one for the fast ones... Jens -- webit! Gesellschaft für neue Medien mbH www.webit.de Dipl.-Wirtschaftsingenieur Jens Krämer [EMAIL PROTECTED] Schnorrstraße 76 Tel +49 351 46766 0 D-01069 Dresden Fax +49 351 46766 66 _______________________________________________ Mongrel-users mailing list Mongrel-users@rubyforge.org http://rubyforge.org/mailman/listinfo/mongrel-users
