7ab7467318
PostgreSQL. This hash function replaces the one used by hash indexes and the catalog cache. Hash joins use a different, relatively poor-quality hash function, but I'll fix that later. As suggested by Tom Lane, this patch also changes the size of the fixed hash table used by the catalog cache to be a power-of-2 (instead of a prime: I chose 256 instead of 257). This allows the catcache to lookup hash buckets using a simple bitmask. This should improve the performance of the catalog cache slightly, since the previous method (modulo a prime) was slow. In my tests, this improves the performance of hash indexes by between 4% and 8%; the performance when using btree indexes or seqscans is basically unchanged. Neil Conway <neilconway@rogers.com> |
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