Ubuntu Linux 2.6.22-14-generic

####################################
ruby 1.8.6 (2007-06-07 patchlevel 36) [i486-linux]
ruby bench_fib_recursive.rb
####################################
  2.280000   0.360000   2.640000 (  2.657154)
  2.320000   0.280000   2.600000 (  2.621729)
  2.400000   0.280000   2.680000 (  2.683187)
  2.250000   0.360000   2.610000 (  2.630242)
  2.260000   0.420000   2.680000 (  2.682511)
  2.210000   0.410000   2.620000 (  2.630155)
  2.280000   0.350000   2.630000 (  2.638551)
  2.300000   0.330000   2.630000 (  2.634489)

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ruby 1.8.6 (2008-04-22 rev 6555) [i386-jruby1.1.1]
jruby -J-server bench_fib_recursive.rb
####################################
  0.665000   0.000000   0.665000 (  0.666000)
  0.363000   0.000000   0.363000 (  0.363000)
  0.404000   0.000000   0.404000 (  0.403000)
  0.349000   0.000000   0.349000 (  0.349000)
  0.450000   0.000000   0.450000 (  0.450000)
  0.389000   0.000000   0.389000 (  0.389000)
  0.389000   0.000000   0.389000 (  0.389000)
  0.390000   0.000000   0.390000 (  0.390000)