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https://issues.apache.org/jira/browse/MATH-899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498870#comment-13498870
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Gilles commented on MATH-899:
-----------------------------
Referring to the quoted code block.
Only the block that will be executed if the condition is true must synchronized
(assuming that "mti" is to be "volatile").
{code}
if (mti >= N) {
updateMtArray();
mti = 0;
}
{code}
where "updateMtArray()" would be "synchronized".
We thus have a finer-grained thread-safety (locking occurs every N calls).
> 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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