Ruby Fibonacci speed tests

test_results.txt

ruby 1.8.6 (2009-06-08 patchlevel 369) [x86_64-linux]
      user     system      total        real
 26.120000   0.000000  26.120000 ( 26.138303)
 26.190000   0.000000  26.190000 ( 26.240107)
 26.420000   0.000000  26.420000 ( 26.505781)

ruby 2.0.0dev (2012-01-03 trunk 34198) [x86_64-linux]
       user     system      total        real
   6.830000   0.000000   6.830000 (  6.852544)
   6.820000   0.000000   6.820000 (  6.833333)
   6.580000   0.000000   6.580000 (  6.581762)

ruby 2.0.0dev (2011-12-26 trunk 34125) [x86_64-linux]
       user     system      total        real
   6.410000   0.000000   6.410000 (  6.412703)
   6.420000   0.000000   6.420000 (  6.433833)
   6.430000   0.000000   6.430000 (  6.432210)

ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]
      user     system      total        real
 28.280000   0.000000  28.280000 ( 28.286401)
 27.830000   0.000000  27.830000 ( 27.845730)
 28.920000   0.000000  28.920000 ( 28.929421)

ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-linux]
       user     system      total        real
   6.360000   0.010000   6.370000 (  6.387824)
   6.320000   0.010000   6.330000 (  6.345590)
   6.360000   0.000000   6.360000 (  6.368149)

jruby 1.6.5 (ruby-1.8.7-p330) (2011-10-25 9dcd388) (OpenJDK 64-Bit Server VM 1.6.0_23) [linux-amd64-java]
      user     system      total        real
  2.849000   0.000000   2.849000 (  2.713000)
  2.140000   0.000000   2.140000 (  2.140000)
  2.143000   0.000000   2.143000 (  2.143000)

ruby (ree) 1.8.7 (2011-12-28 patchlevel 357) [x86_64-linux]
      user     system      total        real
 25.450000   0.020000  25.470000 ( 25.670559)
 25.240000   0.000000  25.240000 ( 25.258224)
 25.300000   0.000000  25.300000 ( 25.436595)

rubinius 2.0.0dev (1.8.7 8ba13d96 yyyy-mm-dd JI) [x86_64-unknown-linux-gnu]
      user     system      total        real
  5.112320   0.000000   5.112320 (  5.147931)
  4.956310   0.004000   4.960310 (  4.971012)
  5.092318   0.012001   5.104319 (  5.113250)

test_speed.rb

require 'benchmark'

def fib(n)
  n < 2 ? n : fib(n-1) + fib(n-2)
end

n = 33

Benchmark.bm do |x|
  x.report { for i in 1..n; fib(i); end }
  x.report { 1.upto(n) { |i| fib(i) } }
  x.report { (1..n).each { |i| fib(i) } }
end

test_speed.sh

rvm all do 'ruby -v; ruby test_speed.rb'