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https://issues.apache.org/jira/browse/SYSTEMML-1767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1767.
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> 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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