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unless (fork)
{
...
    do_subroutine ();
    exit;
}

use strict;
use warnings;
...

number  1000000
seconds 5.234

use strict;
use warnings;
...

number  1000000
seconds 2.086

use strict;
use warnings;
...

number  1000000
seconds 2.142

use strict;
use warnings;
...

number  1000000
seconds 2.087