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use threads;  # add line before loading MCE (to spin threads)
1 thread     12.473 seconds
...
fork 
1 process     7.331 seconds
4 processes   1.848 seconds  3.97x

-rw-r--r--. 1 mario mario 80348000 Oct  9 22:15 nightfall.txt
-rw-r--r--. 1 mario mario 20087000 Oct  9 22:12 nightfall1.txt
...
2.274 secs Child 11196 finished working on nightfall3.txt!
2.275 secs Child 11195 finished working on nightfall2.txt!
2.276 secs Parenting talking...all my children are finished! Hooray!

mce-process-entire-chunk.pl  1.848 seconds
mce-process-line-by-line.pl  2.264 seconds  2.235 ~ 2.281

    user_func => sub {
        # worker chunk routine
...
        print $OUT_FH $$chunk_ref; $OUT_FH->flush;
        MCE->relay_unlock;
    }

    user_func => sub {
        # worker chunk routine
...
        print $OUT_FH $output; $OUT_FH->flush;
        MCE->relay_unlock;
    }