This ticket seems to be at least somewhat related to your questions:
http://dev.clojure.org/jira/browse/CLJ-1420
Andy
On Tue, Jun 3, 2014 at 11:32 AM, Mars0i <marsh...@logical.net> wrote:
> t appears that the random number generator for rand used can't be
> reseeded, so there is no way to precisely repeat an experiment involving
> randomness, except by redefining rand. Also, there is no way to specify
> that rand in different threads should use different RNGs (a strategy
> discussed in this thread
> <https://groups.google.com/forum/#!searchin/clojure/random/clojure/cRVS19PB06E/8FsmtsYx6SkJ>).
> It appears that this creates a bottleneck when using Clojure's parallel
> functions such as pmap. (Try timing map rand vs. pmap rand.) Again, this
> can be fixed by rebinding rand, but that's an ugly solution.
> clojure.data.generators <http://clojure.github.io/data.generators/>
> allows rebinding the RNG, but only for its own functions. I wonder whether
> Clojure's core ought to allow rebinding the RNG behind rand, rand-int, and
> rand-nth. I haven't found discussions of this issue. It's reflects a
> common need in scientific computing.
>
> btw bigmlcom/sampling <https://github.com/bigmlcom/sampling> also
> supports use of RNGs with different seeds (as well as providing different
> algorithms).
>
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