A Simple Memory Profiler

Taken directly from Ruby Performance Optimization

Install Instructions

1. include gem 'memeasure'
2. bundle install

Usage Instructions

Say you have the following code:

class Person
  def name
    1000.times { "x" * 1024 * 1024 * 10 } # A 10 MB string
  end
end

And you want to see how much memory it takes to run your Person#name method. You'd simply have to pass your code as a block to Measure.run

require 'memeasure'

class Person

  def name
    Measure.run do
      1000.times { "x" * 1024 * 1024 * 10 }
    end
  end
end

Jumping into a rails/irb console, loading this file, and running Person.new.name will generate the output in a similar format to:

{"2.2.0": {"gc": "enable", "time": 2.1, "gc_count": 10, "memory": "525 MB"}}