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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2012/11/18 22:40:58 UTC

[jira] [Resolved] (MATH-899) A random crash of MersenneTwister random generator

     [ https://issues.apache.org/jira/browse/MATH-899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gilles resolved MATH-899.
-------------------------

       Resolution: Fixed
    Fix Version/s: 3.1

"MersenneTwister" not being thread-safe, if an instance is to be accessed from multiple threads, it must be through the wrapper proposed in this discussion.

                
> 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
>             Fix For: 3.1
>
>         Attachments: SynchronizedRandomGenerator.java, SynchronizedRandomGeneratorTest.java
>
>
> 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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