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https://issues.apache.org/jira/browse/LUCENE-3935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241327#comment-13241327
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Uwe Schindler commented on LUCENE-3935:
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+1, Robert and I already discussed about making one array out of it. It was at
the time when I rewrote the hairy targetMap to be much more memory effective
and not a huuuuuuge array of arrays with 1 entry each :-)
> Optimize Kuromoji inner loop - rewrite ConnectionCosts.get() method
> -------------------------------------------------------------------
>
> Key: LUCENE-3935
> URL: https://issues.apache.org/jira/browse/LUCENE-3935
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/analysis
> Affects Versions: 3.6, 4.0
> Reporter: Christian Moen
> Attachments: LUCENE-3935.patch
>
>
> I've been profiling Kuromoji, and not very surprisingly, method
> {{ConnectionCosts.get(int forwardId, int backwardId)}} that looks up costs in
> the Viterbi is called many many times and contributes to more processing time
> than I had expected.
> This method is currently backed by a {{short[][]}}. This data stored here
> structure is a two dimensional array with both dimensions being fixed with
> 1316 elements in each dimension. (The data is {{matrix.def}} in
> MeCab-IPADIC.)
> We can rewrite this to use a single one-dimensional array instead, and we
> will at least save one bounds check, a pointer reference, and we should also
> get much better cache utilization since this structure is likely to be in
> very local CPU cache.
> I think this will be a nice optimization. Working on it...
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