From: Paul Brannan <pbrannan@...>
Date: 2008-06-03T00:29:37+09:00
Subject: Re: Huge performance gap

On Tue, May 13, 2008 at 12:26:48PM +0900, Charles Oliver Nutter wrote:
> And Ruby 1.9:
> 
> ~/NetBeansProjects/jruby ??? ../ruby1.9/ruby -I ../ruby1.9/lib 
> test/bench/bench_fib_recursive.rb
>   0.400000   0.010000   0.410000 (  0.412421)
>   0.400000   0.000000   0.400000 (  0.407236)
>   0.400000   0.000000   0.400000 (  0.415222)
>   0.400000   0.010000   0.410000 (  0.417042)
>   0.400000   0.000000   0.400000 (  0.452934)
> 
> So yes, there's definitely room to improve all the implementations...

Similar speedups with ludicrous, which isn't even very smart about its
optimizations:

cout@bean:~/download/jruby/jruby/test/bench$ ruby1.9 bench_fib_recursive.rb
  1.450000   0.030000   1.480000 (  1.628318)
  0.930000   0.020000   0.950000 (  1.956004)
  0.920000   0.020000   0.940000 (  0.937877)
  0.930000   0.020000   0.950000 (  0.958286)
  0.930000   0.020000   0.950000 (  0.946474)

cout@bean:~/download/jruby/jruby/test/bench$ ludicrous bench_fib_recursive.rb
  0.670000   0.010000   0.680000 (  0.679764)
  0.670000   0.020000   0.690000 (  0.688893)
  0.680000   0.010000   0.690000 (  0.695944)
  0.680000   0.010000   0.690000 (  0.694999)
  0.680000   0.020000   0.700000 (  0.696761)

Paul