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https://issues.apache.org/jira/browse/SYSTEMML-1838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1838.
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> Performance issues sparse/ultra-sparse binary read
> --------------------------------------------------
>
> Key: SYSTEMML-1838
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1838
> Project: SystemML
> Issue Type: Bug
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> Recent experiments with PageRank (20 iterations) on a 1M x 1M, sp=0.001 input
> showed that the actual iterations are indeed very fast, at peak memory
> bandwidth (i.e., ~500ms per iteration in CP only) but the initial read is
> unnecessarily slow, and thus dominating the entire execution time. For
> example, in this scenario, the read took 41s.
> This task aims to improve the read performance of sparse and ultra-sparse
> matrices into CP.
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