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Benchmark: running Time::HiRes::time, time, each for at least 1 CPU se
+conds...
Time::HiRes::time:  2 wallclock secs ( 0.82 usr +  0.22 sys =  1.04 CP
+U) @ 1071260.58/s (n=1114111)
...
                       Rate Time::HiRes::time              time
Time::HiRes::time 1071261/s                --              -41%
time              1816839/s               70%                --

($counter += 1) %= 5;    # 0, 1, 2, 3, 4, 0, 1, 2..4, 0..4, 0..4, ...
($counter += 1) %= 256;  # 0..255, 0..255, ...