rails_profiling.rb

# Q&D Rails Profiling
# Credit Dan Mange: http://www.dcmanges.com/blog/rails-performance-tuning-workflow
require "ruby-prof"
class ApplicationController < ActionController::Base
  around_filter :profile
  
  def profile
    return yield if params[:profile].nil?
    result = RubyProf.profile { yield }
    printer = RubyProf::GraphPrinter.new(result)
    out = StringIO.new
    printer.print(out, 0)
    response.body.replace out.string
    response.content_type = "text/plain"
  end
end