or download this
abowley@lave:~$ ./lowest.pl
Benchmark: running Method 1, Method 2, each for at least 20 CPU second
+s...
Method 1: 25 wallclock secs (19.80 usr + 0.21 sys = 20.01 CPU) @ 42
+.53/s (n=851)
Method 2: 25 wallclock secs (20.33 usr + 0.22 sys = 20.55 CPU) @ 43
+.16/s (n=887)