or download this
[08:35:03 jhorner@gateway scripts]$ ./20000608-2.pl
Benchmark: timing 100000 iterations of a, b...
a: 2 wallclock secs ( 1.49 usr + 0.00 sys = 1.49 CPU) @ 67
+114.09/s (n=100000)
b: 1 wallclock secs ( 1.64 usr + 0.00 sys = 1.64 CPU) @ 60
+975.61/s (n=100000)
[08:35:16 jhorner@gateway scripts]$