libdevel-size-perl

Perl extension for finding the memory usage of perl variables
  https://metacpan.org/release/Devel-Size
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Devel::size figures out the real sizes of perl variables in bytes. call functions with a reference to the variable you want the size of. if the variable is a plain scalar it returns the size of the scalar. if the variable is a hash or an array, use a reference when calling.