[Openmcl-devel] Hash Table performance
osei.poku at gmail.com
Tue Sep 23 17:58:29 EDT 2008
CCL extensively uses the ENUMERATE-HASH-KEYS-AND-VALUES function
underneath most of hash table functions (MAPHASH, WITH-HASH-TABLE-
ITERATOR). This causes a great deal of waste when iterating through a
very large hash table (like I have now ~10^8 entries). The way I
understand the code from briefly looking at l0-hash.lisp and
hash.lisp, the contents of the hash table are first stored in a pair
of vectors, then the vectors are iterated through.
WITH-HASH-TABLE-ITERATOR is used everywhere like in the expansion of
the LOOP macro. There is simply no standard way in CCL to iterate
through the contents of a hash table without doing this double work.
Is there some fundamental limitation of the way hash tables are
implemented in CCL that prevent iterating through its contents only
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