ANN: splitmix

Posted on 2017-06-30 by Oleg Grenrus packages

Pure Haskell implementation of SplitMix described in

Guy L. Steele, Jr., Doug Lea, and Christine H. Flood. 2014. Fast splittable pseudorandom number generators. In Proceedings of the 2014 ACM International Conference on Object Oriented Programming Systems Languages & Applications (OOPSLA '14). ACM, New York, NY, USA, 453-472. DOI:

In simple benchmarks generating Word64: splitfix is 3-7x faster than tf-random and 15-70x faster than random. (The difference aren't as huge, when generating Int)

Another difference is the fact that splitmix generates 64bit integers (Word64). tf-random generates 32bit (Word32) and random ordinary integers (Int). Generating 64 bit integers "natively" is nice, as we need only single step to generate Double, which are useful for Monte-Carlo simulations.

splitmix also performs well in dieharder tests.

Find splitmix on Hackage and Github

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