for our $n ( map 10**$_, 1, 3, 6 ) {
    print "Benchmarking $n values";
    our @n = map int( rand $n ), 1 .. $n;
    cmpthese -log $n, {
        sort => q[ 
            my $t = $n >> 1; 
            my @m = sort{ $a<=>$b } @n; 
            my $c=0; 
            $c++ while $m[ $c ] <= $t; 
            my $pct= ( @m - $c ) / @m * 100; 
        ],
        grep => q[ 
           my $t = $n >> 1; 
           my $pct = grep({ $_ > $t } @n ) / @n * 100; 
        ],
    };
};;

Benchmarking 10 values
         Rate sort grep
sort 285546/s   -- -62%
grep 751484/s 163%   --

Benchmarking 1000 values
        Rate sort grep
sort  3525/s   -- -71%
grep 12328/s 250%   --

Benchmarking 1000000 values
       Rate sort grep
sort 1.13/s   -- -90%
grep 11.4/s 911%   --