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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 closed SYSTEMML-1593.
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> 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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