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   key-value pair: 112 bytes
   total data for 125,000 key-value pairs: 13.25M
   virtual memory usage for array built via push @aData, $k, $v:  26M
   virtual memory usage for hash built via  $hData{$k} = $v:  34M

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use strict;
use warnings;
...

warn `ps -o vsz -p $$ 2>NUL`, ' ';