Matthias Boehm created SYSTEMML-1269: ----------------------------------------
Summary: Performance sparse matrix collect Key: SYSTEMML-1269 URL: https://issues.apache.org/jira/browse/SYSTEMML-1269 Project: SystemML Issue Type: Sub-task Reporter: Matthias Boehm In case of sparse matrices, our RDD collect functionality exhibits unnecessary overhead for (1) repeated sparse row allocations (due to missing exploitation of the number of non-zeros which affects the growth rate), and (2) deep copies of sparse rows (even in cases like a single column block, where this is not required). -- This message was sent by Atlassian JIRA (v6.3.15#6346)