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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-1881) Tuning parfor degree of parallelism for operations
Date Sat, 02 Sep 2017 06:30:01 GMT
Matthias Boehm created SYSTEMML-1881:
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             Summary: 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


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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