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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (SYSTEMML-1767) Performance issues codegen rowwise (column aggregation) w/ wide matrices
Date Fri, 14 Jul 2017 19:56:00 GMT

     [ https://issues.apache.org/jira/browse/SYSTEMML-1767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Boehm closed SYSTEMML-1767.
------------------------------------

> 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
>            Assignee: Matthias Boehm
>             Fix For: SystemML 1.0
>
>
> 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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