Easy profiling w/ ruby-prof

profile.rb

def profile(prefix = "profile")
  result = RubyProf.profile { yield }

  dir = File.join(Rails.root, "tmp", "performance", params[:controller].parameterize
  FileUtils.mkdir_p(dir)
  
  file = File.join(dir, "callgrind.%s.%s.%s" % [prefix.parameterize, params[:action].parameterize, Time.now.to_s.parameterize] )
  open(file, "w") { |f| RubyProf::CallTreePrinter.new(result).print(f, :min_percent => 1) }
end