We launched http://blitz.io (a Sinatra app on Heroku) a few weeks back
to help with instant load testing of cloud apps. We’ve been using this
against our rails app deployed on Heroku to help us understand the
performance of our controllers, CouchDB queries as well as the number
At this point, we are really looking for feedback from developers to
see if this helps you. We’ve also released a Ruby Gem that uses the
RESTful API of blitz.io so you can instantly load test as part of your
Rake tasks, post-commit hooks or any of your unit testing frameworks.
Thanks and feedback much appreciated!