Ruby Performance Testing Tips and Tricks - Engine Yard Blog | Engine Yard Blog

@langalex and

We use Ilya Grigorik’s em-proxy to fork traffic in real time from our production environment to a load testing environment which is identical save for the new code. (See the duplex.rb example in em-proxy). We use Engine Yard’s “Clone Environment” feature to make a reasonably up-to-date copy of production, and we use a Chef recipe to toggle em-proxy on and off. We use New Relic RPM to keep an eye on performance, and make sure that the load testing environment performance is acceptable. Once we’ve run a few hours to a day’s worth of traffic, we’ll shut down the load testing environment, and deploy the change live.

Full article: http://www.engineyard.com/blog/2011/ruby-performance-test...