How can I profile a request in Ruby on Rails?
profiling, ruby-on-rails
Solution
ruby-prof is the way to go. Here's a howto, How to profile your Rails and Ruby applications with ruby-prof.
If you use it in combination with a visualisation tool such as kcachegrind, you can easily separate the code that is your application code from the framework code.
I gave a talk on these tools at my local Ruby-users group a while back: Making your rails app kick ass with ruby-prof and kcachegrind.
Problem
How can I profile a controller action? One of my views is taking quite some time to render, and I'd like to break it down. I see `script/performance/profiler`, but that seems to only have access to the global scope.