FWIW, I don't PDL, but if I did, I'd ask:
What type of piddle?
this suggests size limits beyond available memory
http://pdl.perl.org/PDLdocs/Core.html#howbig
$size = howbig($piddle->get_datatype);
Maybe you can assign to nelem?
OTOH zentara says in RFC: PDL Cheat Sheet that PDL has a limit set of 30000 elements that 30k
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