How can I find out how much memory my datastructure is using up

Use Elian's marvellous Devel::Size e.g

use Devel::Size 'total_size';

my %struct = ("key1" => ["bill","ben"],
              "key2" => ["dave","jen"]);

print "total size of %struct - ", total_size(\%struct);

__output__

total size of %struct - 412
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See. Devel::Size for more info.
HTH

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broquaint