$ perl bench_inside_outside.pl
             Rate  outside outside2   inside  inside2
outside   90269/s       --     -20%     -40%     -51%
outside2 113390/s      26%       --     -25%     -39%
inside   151060/s      67%      33%       --     -19%
inside2  185735/s     106%      64%      23%       --