Manage Your Performance with Cgroups and Projects

June 29 2009

Imagine for a moment that you're a capacity planner for a successful LAMP-based web site, and management has just "gifted" you with a new reporting program. You now have to somehow shoehorn it onto the server without hurting the performance of the existing programs. Insoluble problem? Not a bit! All you… read more

Why "Twice Service Time"?

June 19 2009

A colleague asked me why I said to use a ratio of response time to service time of 2:1 in Sizing to Fail. Was it just magic, or was there any science behind it? It turns out to be a range, found by observation, rather like the number of things… read more

Sizing to Fail

May 30 2009

Out of your management asks you for a sizing estimate for the program in production, with 1500 users. You've only ever tested with 100 simulated users in JMeter, you don't have a machine big enough to test 1500 users on, and management need the answer by the end of today.… read more