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https://issues.apache.org/jira/browse/SYSTEMML-1881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1881.
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> Tuning parfor degree of parallelism for operations
> --------------------------------------------------
>
> Key: SYSTEMML-1881
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1881
> Project: SystemML
> Issue Type: Task
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> Currently, we assign remaining parfor parallelism conservatively to
> operations of the parfor body. Consider, for example, a Kmeans or MSVM
> scenario with 10 runs or 10 classes respectively. On a box with 16 HW
> threads, we assign k=10 to the parfor and {{floor(16/10)}} to remaining
> operations. Since it is usually a good idea to slightly over-provision CPU in
> order to get full utilization (due to barriers at the end of each operation),
> we should tune this to {{round(16/10)}} which provides performance
> improvements of about 15% in above examples.
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