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==The hash==
MurmurHash 2.0 is a relatively simple algorithm, which compiles down to about 52 instruction on the [[x86]]. It is noted[http://torum.net/page/2/] for being exceptionally fast, often two to four times faster than comparable[http://google-sparsehash.googlecode.com/svn/trunk/doc/performance.html]
A survey of hash functions[http://www.strchr.com/hash_functions] concluded that "Murmur2 is the only of the complex hash functions that provides good performance for all kinds of keys. It can be recommended as a general-purpose hashing function."
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