Monitoring Rails Performance with Munin and a Mongrel

Rails makes things easy on developers—maybe too easy. It’s not uncommon to reference an association while iterating over a collection of objects, resulting in a performance-devouring N+1 queries being executed. Of course, this is easily fixed with eager loading of the association, but you get my point. Rails can be a big gun, and it’s easy to blow off your foot. Once your application is moved into production, it becomes important to keep an eye on performance over time in order to get a fe...

http://onrails.org/articles/2007/08/31/monitoring-rails-performance-with-munin-and-a-mongrel

http://b.hatena.ne.jp/entry/http://onrails.org/articles/2007/08/31/monitoring-rails-performance-with-munin-and-a-mongrel