Matthias Boehm resolved SYSTEMML-1767.
       Resolution: Fixed
         Assignee: Matthias Boehm
    Fix Version/s: SystemML 1.0

> 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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