JRuby
                                              user     system      total        real
control                                   0.090000   0.000000   0.090000 (  0.089813)
one rescue                                0.269000   0.000000   0.269000 (  0.269248)
one rescue + raise                        0.253000   0.000000   0.253000 (  0.253457)
five rescues                              0.240000   0.000000   0.240000 (  0.240130)
five rescues + raise                      2.304000   0.000000   2.304000 (  2.304633)

1.9
                                              user     system      total        real
control                                   0.160000   0.000000   0.160000 (  0.161714)
one rescue                                0.160000   0.000000   0.160000 (  0.160496)
one rescue + raise                        0.160000   0.000000   0.160000 (  0.159170)
five rescues                              0.150000   0.000000   0.150000 (  0.161715)
five rescues + raise                     13.350000   1.010000  14.360000 ( 14.581655)