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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2018/03/07 08:19:00 UTC

[jira] [Created] (SYSTEMML-2172) Repartitioning before caching ulta-sparse matrices

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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