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From "Dmitriy Lyubimov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAHOUT-1724) Optimizations of matrix-matrix in-core multiplication based on structural flavors
Date Tue, 02 Jun 2015 23:27:51 GMT
Dmitriy Lyubimov created MAHOUT-1724:
----------------------------------------

             Summary: 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.




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