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Posted to dev@lucene.apache.org by "Christian Moen (Assigned) (JIRA)" <ji...@apache.org> on 2012/03/30 11:14:38 UTC
[jira] [Assigned] (LUCENE-3935) Optimize Kuromoji inner loop -
rewrite ConnectionCosts.get() method
[ https://issues.apache.org/jira/browse/LUCENE-3935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Christian Moen reassigned LUCENE-3935:
--------------------------------------
Assignee: Christian Moen
> 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
> Assignee: 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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