timing code in ruby/rails

I have a rake task/batch job that is taking too long and im trying to track down in production where the time is being spent. For now I have started adding:

   start_time = Time.now

   # logic

   end_time = Time.now
   elapsed_time = end_time - start_time
   puts "Elapsed time is #{elapsed_time} for this logic"

Is this the b开发者_C百科est way to do this? I dont want to install any external tools in production. I need finer grained timings that method levels, because I need to know what data was being used for each method/section etc.

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I think you'll get the most bang for your buck using a profiler (like ruby-prof). This will show you exactly where your time is being spent.

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There's the Benchmark module from the standard library that you could use. It shows th same kind of output as the time command. I would link you but I am on my phone, sorry.