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https://issues.apache.org/jira/browse/SYSTEMML-1593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm resolved SYSTEMML-1593.
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Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.0
> 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
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> 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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