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This paper describes an implementation of a Linear Congruential Generator (LCG) based on the binary representation of the normal number α 2 , 3 , and of a combined generator based on that LCG. The base LCG with the modulus 3 33 provides a quality sequence with the period ≈3.7⋅10 15 , which passes all but two statistical tests from BigCrush test suite. We improved on the original implementation by adapting Barrett’s modular reduction method, which resulted in four-fold increase in efficiency. The combined generator has the period of ≈10 23 and passes all tests from BigCrush suite. Program summary Program title: BCNRandom Catalogue identifier: AEPG_v1_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEPG_v1_0.html Program obtainable from: CPC Program Library, Queen’s University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 1201 No. of bytes in distributed program, including test data, etc.: 13715 Distribution format: tar.gz Programming language: C. Computer: IBM PC; MacBook Pro. Operating system: Windows 7, Linux, Unix, OS X. RAM: 512 KB Classification: 4.13. Nature of problem: This is a fast pseudorandom number generator based on normal numbers, with long period and good statistical properties. It passes all 106 BigCrush statistical tests and is faster than C standard library rand generator. Suitable for parallel execution by multiple threads and/or processes because of skip ahead property. Solution method: Linear Congruential Generators with specially chosen parameters are used. A customized fast modular reduction is employed. Running time: Generation rate is 100–200 million numbers per second. |
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