Matthias Boehm created SYSTEMML-2172:
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Summary: Repartitioning before caching ulta-sparse matrices
Key: SYSTEMML-2172
URL: https://issues.apache.org/jira/browse/SYSTEMML-2172
Project: SystemML
Issue Type: Bug
Reporter: Matthias Boehm
Ultra-sparse matrices have dedicated serialized block representation which
means that their in-memory storage in CSR can be much larger than on disk which
leads to a blow-up of 128MB partitions to >1GB partitions. Accordingly, we
should repartition the data before the initial caching in order to remove
memory pressure and exploit the full parallelism.
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