Matthias Boehm created SYSTEMML-1881: ----------------------------------------
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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)