Simple ruby memory benchmark

gistfile1.rb

module Benchmark
  def memory_usage
    `ps -o rss= -p #{Process.pid}`.to_i
  end
  def memory
    m0 = memory_usage
    yield
    memory_usage - m0
  end
  def kb
    0.001 * memory { yield }
  end
  def mb
    0.000001 * memory { yield }
  end
  module_function :memory, :mb, :kb, :memory_usage
end