benchmark.rb

profiler = ENV['PROFILER'] || 'none'

case profiler
when 'ruby-prof'
  require 'ruby-prof'
  RubyProf.start
when 'trace'
  require 'trace'
  Trace.init_buffer
end

def fibonacci(n)
  return 1 if n <= 1
  fibonacci(n - 1) + fibonacci(n - 2)
end

start_time = Time.now
fibonacci(30)
duration = Time.now - start_time

puts "duration: %.6f seconds" % duration