A perfect hash function (PHF) is an injective function that maps keys from a set S to unique values. Since no collisions occur, each key can be retrieved from a hash table with a single probe. A minimal perfect hash function (MPHF) is a PHF with the smallest possible range, that is...
- 1 - SmoothPerf: A Perfect Hash Function Based on Smoothing Techniques GONG Caichun 1+2 , ZHANG Huaping 1 , XU Hongbo 1 , CHENG Xueqi 1 , BAI Shuo 1 1 (Institute of Computing Technology, CAS, Beijing 100080, China) 2 (Graduate School of the Chinese Academy of Sciences , Beijing 10...
You can find a good (and fast) hash function, and an interesting read, at http://www.azillionmonkeys.com/qed/hash.html The only time you should not check for collisions, is if you use a perfect hash -- a good old fashioned lookup table, like gperf. Share Improve this answer Follow ...
they are among the most approachable algorithms and certainly the most enjoyable to tinker with. Moreover, the endless search for the Holy Grail, a perfect hash function for a given data set, still consumes considerable ink in each year's batch of computer-science journals...
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respond to the client, calling the writeToClient function The third phase is more time-consuming (redis added some IO threads to help complete these tasks faster), I think in this phase, the work of rehash through BIO threads can also be carried out in parallel, without affecting the premis...
Design strategies for minimal perfect hash functions. Summary: A minimal perfect hash function $h$ for a set $S \\\subseteq U$ of size $n$ is a function $h\\\colon Uo \\\{0,\\\dots,n-1\\\}$ that is one-to-one on $S$. The complexity measures of interest are storage space...
PerfectHashBulkCreate.exe Usage: <KeysDirectory> <OutputDirectory> <Algorithm> <HashFunction> <MaskFunction> <MaximumConcurrency> [BulkCreateFlags] [KeysLoadFlags] [TableCreateFlags] [TableCompileFlags] [TableCreateParameters] PerfectHashCreate.exe Usage: <KeysPath> <OutputDirectory> <Algorithm> <Hash...
A new algorithm for finding minimal perfect hash functions (MPHF) is proposed. The algorithm given three pseudorandom functions, h0, h1 and h2, searches for a function g such that F(w)=(h0(w)+(h1(w))+g(h2(w)) mod m is a MPHF, where m is a number of input words. The algori...