[jira] [Commented] (RNG-111) Jenkins Small Fast generator

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[jira] [Commented] (RNG-111) Jenkins Small Fast generator

ASF GitHub Bot (Jira)

    [ https://issues.apache.org/jira/browse/RNG-111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16931578#comment-16931578 ]

Alex D Herbert commented on RNG-111:

I think at the moment there is a bit of inconsistency where the name of the author appears in one generator but not another. Here are some points:

* None of any of the other enum values specify the author in their name
* Doty-Humphrey named his generator sfcNN (NN is for the state size)
* Bob Jenkins did not explicity name his generator but called it 'small fast'
* Doty-Humphrey named Jenkins generator jsf

Stripping the author would be:

* SFC_32
* SFC_64
* SF_32
* SF_64

At least this shows the two are related. I would vote for this option and deal with name clashes in the future.

> Jenkins Small Fast generator
> ----------------------------
>                 Key: RNG-111
>                 URL: https://issues.apache.org/jira/browse/RNG-111
>             Project: Commons RNG
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.3
>            Reporter: Alex D Herbert
>            Assignee: Alex D Herbert
>            Priority: Minor
>             Fix For: 1.3
> Implement Bob Jenkins' Small/Fast Chaotic PRNG.
> [A small noncryptographic PRNG|http://burtleburtle.net/bob/rand/smallprng.html]
> Variants are provided for 32-bit and 64-bit output. The generators use bit shifts to avalanche state and many variants are provided for different shift combinations. However there is a recommended variant that has been more extensively tested. A seeding routine is provided to ensure that generators with short cycles are avoided.
> This generator has no name but appears in PractRand as JSF (Jenkins Small Fast).

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