[ https://issues.apache.org/jira/browse/SYSTEMML-1767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matthias Boehm resolved SYSTEMML-1767. -------------------------------------- Resolution: Fixed Assignee: Matthias Boehm Fix Version/s: SystemML 1.0 > Performance issues codegen rowwise (column aggregation) w/ wide matrices > ------------------------------------------------------------------------ > > Key: SYSTEMML-1767 > URL: https://issues.apache.org/jira/browse/SYSTEMML-1767 > Project: SystemML > Issue Type: Bug > Reporter: Matthias Boehm > Assignee: Matthias Boehm > Fix For: SystemML 1.0 > > > On scenarios with wide matrices of millions of features, the codegen rowwise > template shows performance issues due to unnecessary multi-threading which > requires additional memory per thread for partial aggregation which leads to > cache thrashing. We should similarly to the mmchain operator establish a > threshold for maximum temporary results and fall back to sequential > operations if this threshold is exceeded. -- This message was sent by Atlassian JIRA (v6.4.14#64029)