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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-899) A random crash of MersenneTwister random generator
Date Sun, 18 Nov 2012 01:06:12 GMT

    [ https://issues.apache.org/jira/browse/MATH-899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499573#comment-13499573
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Gilles commented on MATH-899:
-----------------------------

I've implemented that class.
But I have a hard time implementing a unit test that would consistently reproduce the error
reported here: It does not necessarily happen even with a fairly large number of threads.

The unit test with the synchronized wrapper passes, but it would have been more convincing
to have both, showing that the wrapper indeed solves the problem.

                
> 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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