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From "Thomas Neidhart (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-899) A random crash of MersenneTwister random generator
Date Fri, 16 Nov 2012 12:24:12 GMT

    [ https://issues.apache.org/jira/browse/MATH-899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498763#comment-13498763
] 

Thomas Neidhart commented on MATH-899:
--------------------------------------

Indeed, I think it is a more general problem, as many of the RNGs are not thread-safe (if
not all of them).
It would be nice to have annotations for thread-safe code, so a user would not have to dig
into code to be sure.

For now we could also document in the class javadoc whether an implementation is thread-safe
or not (like we did in commons-codec).
                
> A random crash of MersenneTwister random generator
> --------------------------------------------------
>
>                 Key: MATH-899
>                 URL: https://issues.apache.org/jira/browse/MATH-899
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.0
>         Environment: Windows 7, JDK 1.7.05
>            Reporter: Alexander Nozik
>            Priority: Minor
>
> There is a very small probability that MersenneTwister generator gives a following error:

> java.lang.ArrayIndexOutOfBoundsException: 624
> in MersenneTwister.java line 253
> The error is completely random and its probability is about 1e-8.
> UPD: The problem most probably arises only in multy-thread mode.

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