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use strict;
use warnings;
...
printf "%0.3f seconds\n", time - $start;

$mce->shutdown; # reap workers

chunk_size   1  3.773 seconds    1 million chunks
chunk_size   2  1.930 seconds  500 thousand chunks
chunk_size  10  0.423 seconds  100 thousand chunks
chunk_size  20  0.234 seconds   50 thousand chunks