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https://issues.apache.org/jira/browse/SYSTEMML-1888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1888.
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> Remove parfor rewrite update-in-place for intermediates
> -------------------------------------------------------
>
> Key: SYSTEMML-1888
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1888
> Project: SystemML
> Issue Type: Sub-task
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 0.15
>
>
> This task aims to remove the brittle parfor rewrite on update-in-place for
> intermediates. Since meanwhile, we apply update in-place also for any for
> loop, the performance impact of this rewrite is not critical.
> The issues of this rewrite include poor asymptotic behavior in the number of
> nodes in the parfor program and in the number of candidates, as well as
> brittle comparisons based on hop names and line numbers. In order to not
> stall the 0.15 release, we remove this rewrite for now and reimplement it for
> the 1.0 release.
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