or download this
~$ perl vert4.pl
Benchmark: timing 3 iterations of 1, 10, 100, 1000, 10000, 100000, 100
+0000...
...
(warning: too few iterations for a reliable count)
1000000: 1 wallclock secs ( 0.23 usr + 0.03 sys = 0.26 CPU) @ 11
+.54/s (n=3)
(warning: too few iterations for a reliable count)