When I run the benchmark in C-ruby (2.0.0) I get:

  real	2m35.450s
  user	2m35.257s
  sys	0m0.139s

On jruby with invokedynamic:

  time ruby -Xcompile.invokedynamic=true file2.rb C-large-1.in

  real	1m17.711s
  user	1m15.618s
  sys	0m0.830s

In jruby without invokedynamic time ruby file2.rb C-large-1.in

  real	1m37.856s
  user	1m39.260s
  sys	0m0.854s