Benchmark: timing 100000 iterations of rev 100, rev 1000, rev 10000... rev 100: 1 wallclock secs ( 0.24 usr + 0.00 sys = 0.24 CPU) @ 416666.67/s (n=100000) (warning: too few iterations for a reliable count) rev 1000: 1 wallclock secs ( 0.87 usr + 0.00 sys = 0.87 CPU) @ 114942.53/s (n=100000) rev 10000: 8 wallclock secs ( 7.65 usr + 0.00 sys = 7.65 CPU) @ 13071.90/s (n=100000)