title: Rails 3.0.12 Performance test issues
body: <p>I'm trying to run benchmark and performance tests and I'm not getting the metrics displaying...</p>
  
  <p>ruby -v:</p>
  
  <p><code>ruby 1.9.2p320 (2012-04-20 revision 35421) [x86_64-linux]</code></p>
  
  <p>rvm list:</p>
  
  <p><code>=&gt; ruby-1.9.2-p320-perf [ x86_64 ]</code></p>
  
  <p>the result of running <code>rake test:profile</code>:</p>
  
  <pre><code>BrowsingTest#test_homepage (130 ms warmup)
          process_time: 18446744073.71 sec
                memory: unsupported
               objects: unsupported
  BrowsingTest#test_intel_companies_newstats (34 ms warmup)
          process_time: 26 ms
                memory: unsupported
               objects: unsupported
  </code></pre>
  
  <p>and running <code>rake test:benchmark</code></p>
  
  <pre><code>BrowsingTest#test_homepage (103 ms warmup)
             wall_time: 23 ms
                memory: 0.00 KB
               objects: 0
               gc_runs: 0
               gc_time: 0.00 ms
  BrowsingTest#test_intel_companies_newstats (31 ms warmup)
             wall_time: 9 ms
                memory: 0.00 KB
               objects: 0
               gc_runs: 0
               gc_time: 0.00 ms
  </code></pre>
  
  <p>my gem file</p>
  
  <pre><code>group :test do
      gem 'capybara'
  
      # for performance tests
      gem 'ruby-prof', :git =&gt; 'git://github.com/wycats/ruby-prof.git'
      gem 'test-unit'
  end
  </code></pre>
  
  <p>When I tried to run:</p>
  
  <p><code>rvm install 1.9.2 --patch gcdata --name perf</code></p>
  
  <p>I got:</p>
  
  <pre><code>Installing Ruby from source to: /home/victor/.rvm/rubies/ruby-1.9.2-p320-perf, this may take a while depending on your cpu(s)...
  
  ruby-1.9.2-p320-perf - #fetching 
  ruby-1.9.2-p320-perf - #extracting ruby-1.9.2-p320 to /home/victor/.rvm/src/ruby-1.9.2-p320-perf
  ruby-1.9.2-p320-perf - #extracted to /home/victor/.rvm/src/ruby-1.9.2-p320-perf
  Patch 'gcdata' not found.
  </code></pre>