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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2017/08/15 20:05:01 UTC

[jira] [Resolved] (SYSTEMML-1838) Performance issues sparse/ultra-sparse binary read

     [ https://issues.apache.org/jira/browse/SYSTEMML-1838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm resolved SYSTEMML-1838.
--------------------------------------
       Resolution: Fixed
         Assignee: Matthias Boehm
    Fix Version/s: SystemML 1.0

> 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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