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On 13/12/2012 14:34, Richter, Jörg wrote:
Denis wrote:I'll do some perf tests probably later today. It's for a plain C string pool (don't know if it looks like Lua's, haven't checked). As with lua strings, since they know their sizes and thus I can use memcmp instead of strcmp, size equality must be checked before, so there is a second filter there anyway (after the one due to hash & modulo). This may explain why yet another filter on hash alone possibly does not help much (except maybe if strings commonly have same size).Considering that this check is in the fast-path and lengths are mostly different might explain why I have seen this.
PS: could not do perf tests yesterday (a hard to solve bug made me late). I'll do it using single-length input first, so that same-length-check does not enter the game.
Denis