class Object

def b!(name)
  time1 = Time.now
  begin
    yield
  ensure
    time2 = Time.now
    @@benchmark_results[name] = 0 unless @@benchmark_results.has_key?(name)
    @@benchmark_results[name] += time2 - time1
  end
end

def benchmark_report(main = nil)
  total = 0
  if main.nil?
    @@benchmark_results.each_value do |time|
      total += time
    end
  else
    total = @@benchmark_results[main]
  end
  @@benchmark_results.each_pair do |name, time|
    printf "%-12s: %.4f (%.2f%%)\n", name, time, time / total * 100
  end
  printf "-- Total: %.4f\n", total
end