Ruby vs JRuby

gistfile1.txt

 (pegasus) % cat benchmark.rb
#!/usr/bin/env ruby

t_b = Time.now.to_f

# 50'000 * sin [ -90 .. 90 ]

50000.times do
  ( -90 .. 90 ).each do |x|
    Math.sin(x)
  end
end

t_e = Time.now.to_f

puts "Time : #{t_e - t_b}"
 (pegasus) % ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.0]
 (pegasus) % time ruby benchmark.rb
Time : 4.937260150909424
ruby benchmark.rb  4,94s user 0,01s system 99% cpu 4,959 total
 (pegasus) % rvm use jruby
Using /Users/adaedra/.rvm/gems/jruby-1.6.7.2
 (pegasus) % ruby -v
jruby 1.6.7.2 (ruby-1.8.7-p357) (2012-05-01 26e08ba) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_33) [darwin-x86_64-java]
 (pegasus) % time ruby benchmark.rb
Time : 1.27999997138977
ruby benchmark.rb  2,58s user 0,12s system 136% cpu 1,983 total
 (pegasus) %