Perf comparison of cast_off gem compiler and JRuby indy branch

fib_recursive_result.txt

% cat bench_fib_recursive.rb     
require 'benchmark'

def fib_ruby(n)
  if n < 2
    n
  else
    fib_ruby(n - 2) + fib_ruby(n - 1)
  end
end

TIMES = (ARGV[0] || 5).to_i
N = (ARGV[1] || 30).to_i
TIMES.times {
  puts Benchmark.measure { puts fib_ruby(N) }
}
% ruby -v bench_fib_recursive.rb 
ruby 1.9.3p0 (2011-11-08 revision 33661) [x86_64-linux]
832040
  0.290000   0.000000   0.290000 (  0.291377)
832040
  0.230000   0.000000   0.230000 (  0.224458)
832040
  0.220000   0.000000   0.220000 (  0.223801)
832040
  0.230000   0.000000   0.230000 (  0.225720)
832040
  0.220000   0.000000   0.220000 (  0.225394)
% cast_off --run bench_fib_recursive.rb 
832040
  0.060000   0.000000   0.060000 (  0.061530)
832040
  0.060000   0.000000   0.060000 (  0.060852)
832040
  0.070000   0.000000   0.070000 (  0.062113)
832040
  0.060000   0.000000   0.060000 (  0.066636)
832040
  0.060000   0.000000   0.060000 (  0.061458)
% jruby -Xcompile.invokedynamic=false bench_fib_recursive.rb
jruby 1.7.0.dev (ruby-1.8.7-p352) (2011-11-27 13ad6d6) (Java HotSpot(TM) 64-Bit Server VM 1.7.0_02-ea) [linux-amd64-java]
832040
  0.238000   0.000000   0.238000 (  0.201000)
832040
  0.132000   0.000000   0.132000 (  0.132000)
832040
  0.133000   0.000000   0.133000 (  0.133000)
832040
  0.126000   0.000000   0.126000 (  0.126000)
832040
  0.128000   0.000000   0.128000 (  0.128000)
% jruby bench_fib_recursive.rb                   
832040
  0.172000   0.000000   0.172000 (  0.134000)
832040
  0.042000   0.000000   0.042000 (  0.042000)
832040
  0.040000   0.000000   0.040000 (  0.040000)
832040
  0.041000   0.000000   0.041000 (  0.041000)
832040
  0.042000   0.000000   0.042000 (  0.042000)

tarai_result.txt

% cat bm_app_tarai.rb 
def tarai( x, y, z )
  if x <= y
  then y
  else tarai(tarai(x-1, y, z),
             tarai(y-1, z, x),
             tarai(z-1, x, y))
  end
end

5.times do
  start = Time.now
  tarai(12, 6, 0)
  p Time.now - start
end
% ruby -v bm_app_tarai.rb       
ruby 1.9.3p0 (2011-11-08 revision 33661) [x86_64-linux]
1.304466907
1.046775737
1.05619911
1.034263952
1.018359332
% cast_off --run bm_app_tarai.rb
0.059201368
0.061287277
0.059059633
0.057655381
0.05702261
% jruby -Xcompile.invokedynamic=false bm_app_tarai.rb       
jruby 1.7.0.dev (ruby-1.8.7-p352) (2011-11-27 13ad6d6) (Java HotSpot(TM) 64-Bit Server VM 1.7.0_02-ea) [linux-amd64-java]
0.987
0.431
0.43
0.422
0.439
% jruby -v bm_app_tarai.rb
0.339
0.155
0.157
0.159
0.157