It depends on how you populate the hash. Compare: 
use Data::Dumper;

$hashR = {};
print Dumper $hashR;

$hashR->{$x} = $y;
print Dumper $hashR

[download]

Output:

$VAR1 = {};
$VAR1 = {
          '' => undef
        };

[download]
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Size of an Hash reference by choroba
in thread Size of an Hash reference by dvinay

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