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https://issues.apache.org/jira/browse/SPARK-5766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-5766.
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Resolution: Not A Problem
Or to some degree this is already done via netlib
> Slow RowMatrix multiplication
> -----------------------------
>
> Key: SPARK-5766
> URL: https://issues.apache.org/jira/browse/SPARK-5766
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Amaru Cuba Gyllensten
> Priority: Minor
> Labels: matrix
>
> Looking at the source code for RowMatrix multiplication by a local matrix, it
> seems like it is going through all columnvectors of the matrix, doing
> pairwise dot product on each column.
> It seems like this could be sped up by using gemm, performing full
> matrix-matrix multiplication on the local data, (or gemv, for vector-matrix
> multiplication), as is done in BlockMatrix or Matrix.
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