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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-1593) Performance issues rexpand to ultra-sparse matrix
Date Mon, 08 May 2017 22:24:04 GMT
Matthias Boehm created SYSTEMML-1593:
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             Summary: Performance issues rexpand to ultra-sparse matrix
                 Key: SYSTEMML-1593
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1593
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


For a detailed description see https://www.mail-archive.com/dev@systemml.incubator.apache.org/msg01741.html

The issue is caused by (1) wrong input partitioning (small vector input to huge output only
leverages a small degree of parallelism), and (2) unnecessary shuffle. 



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