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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-1767) Performance issues codegen rowwise (column aggregation) w/ wide matrices
Date Wed, 12 Jul 2017 22:48:00 GMT
Matthias Boehm created SYSTEMML-1767:
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             Summary: Performance issues codegen rowwise (column aggregation) w/ wide matrices
                 Key: SYSTEMML-1767
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1767
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


On scenarios with wide matrices of millions of features, the codegen rowwise template shows
performance issues due to unnecessary multi-threading which requires additional memory per
thread for partial aggregation which leads to cache thrashing. We should similarly to the
mmchain operator establish a threshold for maximum temporary results and fall back to sequential
operations if this threshold is exceeded.



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