A quick benchmark of the different flavors of ruby.

RubyBenchmarks

$ rvm 1.8.7,1.9.2,ree,rbx,macruby-0.8,jruby  benchmark_haversine.rb

## 1.8.7-p330

Rehearsal ---------------------------------------------------
ruby-1.8.7-p330  11.870000   0.030000  11.900000 ( 12.120409)
----------------------------------------- total: 11.900000sec

                      user     system      total        real
ruby-1.8.7-p330  12.020000   0.040000  12.060000 ( 12.556268)

## 1.9.2-p136

Rehearsal ---------------------------------------------------
ruby-1.9.2-p136   7.670000   0.050000   7.720000 (  8.282582)
------------------------------------------ total: 7.720000sec

                      user     system      total        real
ruby-1.9.2-p136   7.600000   0.040000   7.640000 (  8.242693)

## ree-1.8.7

Rehearsal -----------------------------------------------------
ree-1.8.7-2010.02   6.840000   0.010000   6.850000 (  6.965676)
-------------------------------------------- total: 6.850000sec

                        user     system      total        real
ree-1.8.7-2010.02   6.840000   0.020000   6.860000 (  6.947599)

## rbx-head

Rehearsal --------------------------------------------
rbx-head   4.170389   0.029163   4.199552 (  5.112614)
----------------------------------- total: 4.199552sec

               user     system      total        real
rbx-head   4.078300   0.023216   4.101516 (  4.393142)

## macruby-0.8

Rehearsal -----------------------------------------------
macruby-0.8   1.360000   0.000000   1.360000 (  1.443757)
-------------------------------------- total: 1.360000sec

                  user     system      total        real
macruby-0.8   1.360000   0.020000   1.380000 (  1.919017)

## jruby-1.5.6

Rehearsal -----------------------------------------------
jruby-1.5.6   3.495000   0.000000   3.495000 (  3.435000)
-------------------------------------- total: 3.495000sec

                  user     system      total        real
jruby-1.5.6   2.613000   0.000000   2.613000 (  2.613000)