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#!perl 
use strict;
...
        "tail"   => sub {   tail(500000) },
    }
);

    normal: 25 wallclock secs (23.19 usr +  0.59 sys = 23.78 CPU) @  0
+.42/s (n=10)
      tail: 18 wallclock secs (17.44 usr +  0.03 sys = 17.47 CPU) @  0
+.57/s (n=10

#!perl 
use strict;
...
        "tail"   => sub {   tail(1000000) },
    }
);

Benchmark: timing 1 iterations of normal, tail...
    normal: 123 wallclock secs ( 6.58 usr +  1.13 sys =  7.71 CPU) @  
+0.13/s (n=1)
            (warning: too few iterations for a reliable count)
      tail:  3 wallclock secs ( 3.50 usr +  0.01 sys =  3.51 CPU) @  0
+.28/s (n=1)
            (warning: too few iterations for a reliable count)