Matthias Boehm created SYSTEMML-1593:
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Summary: Performance issues rexpand to ultra-sparse matrix
Key: SYSTEMML-1593
URL: https://issues.apache.org/jira/browse/SYSTEMML-1593
Project: SystemML
Issue Type: Bug
Reporter: Matthias Boehm
For a detailed description see
https://www.mail-archive.com/dev@systemml.incubator.apache.org/msg01741.html
The issue is caused by (1) wrong input partitioning (small vector input to huge
output only leverages a small degree of parallelism), and (2) unnecessary
shuffle.
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