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https://issues.apache.org/jira/browse/MAHOUT-1724?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suneel Marthi closed MAHOUT-1724.
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> Optimizations of matrix-matrix in-core multiplication based on structural
> flavors
> ---------------------------------------------------------------------------------
>
> Key: MAHOUT-1724
> URL: https://issues.apache.org/jira/browse/MAHOUT-1724
> Project: Mahout
> Issue Type: Improvement
> Reporter: Dmitriy Lyubimov
> Assignee: Dmitriy Lyubimov
> Fix For: 0.10.2
>
>
> Current times() operation suffers a lot. Especially when e.g. column-major
> iterations are done over a matrix backed by row-major sequential sparse
> vectors, things are dropping orders of magnitude in performance.
> This issue finds optimal traversal gemm kernel order for current matrix; or
> rewrites matrix prior to operation to enable optimal traversals.
> PR https://github.com/apache/mahout/pull/135
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