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C:\test>junk -B=4 < 1gb.dat
Found 6559 matches in 10.778 seconds using 4 kb reads
...

C:\test>junk -B=65536 < 1gb.dat
Found 6559 matches in 12.533 seconds using 65536 kb reads

#! perl -slw
use strict;
...
}
printf "Found %d matches in %.3f seconds using %d kb reads\n",
    $count, time()-$start, $B;