[issue14478] Decimal hashing very slow, could be cached
report at bugs.python.org
Sat Apr 7 14:35:14 CEST 2012
Antoine Pitrou <pitrou at free.fr> added the comment:
> > > I recommend that __hash__ should use functools.lru_cache for caching.
> > Why would you do such a thing? A hash value is a single 64-bit slot, no need to add the memory consumption of a whole dictionary and the runtime cost of a LRU eviction policy when you can simply cache the hash in the object itself (like we already do for strings)...
> It was a joke (I think). Taking into account the fact that LRU cache
> uses a hashtable and need to calculate the hash of arguments (i.e., the
> Decimal self) to get the cached value of hash.
Damn. Shame on me for not understanding Raymond's humour :-)
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