[jira] [Closed] (SYSTEMML-1881) Tuning parfor degree of parallelism for operations

["Matthias Boehm (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SYSTEMML-1881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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