Re: [commons RNG] link to benchmark page from user guide gives 404.

On Wed, 13 Dec 2023 at 11:50, r.c.hoekstra <[email protected]> wrote:
>
> Hi,
>
>
> I need to choose a fast PRNG, but the apache commons RNG user guide has
> a broken link to the page with benchmarks (the user guide page is here:
> https://commons.apache.org/proper/commons-rng/userguide/rng.html#a4._Performance)

This is the correct place. Scroll down and you can see tables of
results for all the RNGs in the library.

Choosing a PRNG is a trade off between the period of the RNG and the
speed. Within a family of RNGs the larger the state size the larger
the period and the slower the RNG. For single thread applications a
128-bit state size will be adequate. If you are using multiple
concurrent RNGs then a larger period will ensure that you reduce the
chance of sequence collision (i.e. overlap).

Also look at the quality of the output:

https://commons.apache.org/proper/commons-rng/userguide/rng.html#a5._Quality

Ideally you should choose a RNG that passes TestU01 (BigCrush) and PractRand.

> The 404 points to here:
> https://commons.apache.org/proper/commons-rng/commons-rng-examples/examples-jmh/apidocs/org/apache/commons/rng/jmh/package-summary.html

This link may have been for an old javadoc location. You can find the
javadoc here:
https://commons.apache.org/proper/commons-rng/commons-rng-examples/commons-rng-examples-jmh/apidocs/index.html

I do not think it is very useful but at least it does show what we
have benchmarked. I will fix the link in the source.

Regards,

Alex