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Ben Pfaff authored
murmurhash is faster than Jenkins and slightly higher quality, so switch to it for hashing words. The best timings I got for hashing for data lengths of the following numbers of 32-bit words, in seconds per 1,000,000,000 hashes, were: words murmurhash Jenkins hash ----- ---------- ------------ 1 8.4 10.4 2 10.3 10.3 3 11.2 10.7 4 12.6 18.0 5 13.9 18.3 6 15.2 18.7 In other words, murmurhash outperforms Jenkins for all input lengths other than exactly 3 32-bit words (12 bytes). (It's understandable that Jenkins would have a best case at 12 bytes, because Jenkins works in 12-byte chunks.) Even in the case where Jenkins is faster, it's only by 5%. On average within this data set, murmurhash is 15% faster, and for 4-word input it is 30% faster. We retain Jenkins for flow_hash_symmetric_...
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