Ruby Fibonacci "Benchmark"

fibonacci.rb

def fib(n)
  if n == 0 || n == 1
    n
  else
    fib(n-1) + fib(n-2)
  end
end

36.times do |i|
  puts "n=#{i} => #{fib(i)}"
end

Timings

Ruby HEAD  - 7,36s user 0,02s system 99% cpu 7,390 total
Ruby 2.1.2 - 7,09s user 0,02s system 99% cpu 7,122 total
Ruby 2.1.1 - 7,02s user 0,01s system 99% cpu 7,049 total
Ruby 2.0.0 - 7,43s user 0,02s system 99% cpu 7,470 total
Ruby 1.9.3 - 10,75s user 0,02s system 99% cpu 10,787 total

Rubinius 2.2.7 - 2,50s user 0,05s system 106% cpu 2,388 total
Jruby 1.7.12   - 7,95s user 0,16s system 156% cpu 5,177 total