In article <20050331082524.GC30965@svana.org>,
Martijn van Oosterhout <kleptog@svana.org> writes:
> Perl uses reference counting, so as long as a string is visibile
> anywhere (remember closures), it stays around and disappears as soon as
> it's unreferenced.
> If you have large strings or arrays you don't need, maybe you need to
> explicitly undef them. Using shift and pop on arrays doesn't copy the
> element for example. Make sure you're using my on all your variables so
> they are cleared on exiting a function.
> Also, this doesn't work on circular references, so if you build
> structures like that you'll need to explicitly break the chain.
... or use WeakRef.