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  1. or download this
       use MCE::Loop max_workers => 4, chunk_size => 1;

...

   } 1..4_000_000;
  2. or download this
       use MCE::Loop max_workers => 4, chunk_size => 'auto';

...

   } 1..4_000_000;
  3. or download this
       use MCE::Loop max_workers => 4, chunk_size => 'auto';

...

   } '/path/to/four_million_rows.txt';
  4. or download this
       ## array non-chunking...:  1m54.467s
   ## array auto-chunking..:  0m 0.843s   136x
   ## file  auto-chunking..:  0m 0.467s   245x
  5. or download this
       ## array non-chunking...:  1m 5.458s
   ## array auto-chunking..:  0m 0.821s    80x
   ## file  auto-chunking..:  0m 0.411s   159x
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       mce_loop_f {
      MCE->last;    # immediately leaves the block and input
      ... 
   } '/path/to/four_million_rows.txt';
  7. or download this
       ## array non-chunking...:  1m 5.384s
   ## array auto-chunking..:  0m 0.747s    88x
   ## file  auto-chunking..:  0m 0.337s   194x