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rails performance scripts profiler benchmarker

There are several ways you can measure your rails application's performance. The techniques range from filling your code with "puts" statements - :p - to fancy ones like NewRelic - which is quite nice, I must say.

But what many people don't know is that rails ships with a handful of scripts to help you out. One of which is called profiler, located under your application's scripts/performance directory.

By default it uses the standard ruby profiler but if you want more speed - and additional reporting options - , consider installing the ruby-prof gem.

So if you execute it without params, you'll get a clue of how it works:


$ script/performance/profiler
Usage: ./script/performance/profiler 'Person.expensive_method(10)' [times] [flat|graph|graph_html]


Pretty self explanatory, right?

As a sample code, I have in my rails app a dumb model with a really dumb method I wanna profile:


  class Article
    def self.find_all_with_delay
      sleep 10
      self.find(:all)
    end
  end


Clearly this method doesn't perform well and is a bottle neck in our super application! But let's see what rails' profiler tells us:


$ script/performance/profiler 'Article.find_all_with_delay' 1 graph > text_graph.perf
Loading Rails...
Using the ruby-prof extension.
Thread ID: 109440
Total Time: 10.147995

  %total   %self     total      self      wait     child            calls   Name
--------------------------------------------------------------------------------
 100.00%   0.00%     10.15      0.00      0.00     10.15                1     Global#[No method] (/Users/leo/projects/test/vendor/rails/railties/lib/commands/performance/profiler.rb:24}  /Users/leo/projects/test/vendor/rails/railties/lib/commands/performance/profiler.rb:24
                     10.15      0.00      0.00     10.15              1/1     Object#profile_me
--------------------------------------------------------------------------------
                     10.15      0.00      0.00     10.15              1/1     Global#[No method]
 100.00%   0.00%     10.15      0.00      0.00     10.15                1     Object#profile_me ((eval):1}  (eval):1
                      0.00      0.00      0.00      0.00              1/1     Class#const_missing
                     10.15      0.00      0.00     10.15              1/1
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