Data::Dumper tracks "seen" references, and this takes a lot of memory for big structures.
Maybe this helps:
$Data::Dumper::Maxdepth or $OBJ->Maxdepth([NEWVAL])
Can be set to a positive integer that specifies the
depth beyond which which we don't venture into a
structure. Has no effect when "Data::Dumper::Purity"
is set. (Useful in debugger when we often don't want
to see more than enough). Default is 0, which means
there is no maximum depth.
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