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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2017/11/30 22:30:00 UTC

[jira] [Closed] (SYSTEMML-1915) Increase default block size to 2048

     [ https://issues.apache.org/jira/browse/SYSTEMML-1915?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm closed SYSTEMML-1915.
------------------------------------
       Resolution: Not A Problem
         Assignee: Matthias Boehm
    Fix Version/s: SystemML 1.0

marked as not a problem because with the used of shared dictionaries, the overhead with small 1k x 1k blocks is acceptable.

> Increase default block size to 2048
> -----------------------------------
>
>                 Key: SYSTEMML-1915
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1915
>             Project: SystemML
>          Issue Type: Sub-task
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 1.0
>
>
> So far we use a default blocksize of 1000 x 1000. This task aims to increase the default blocksize to 2048 x 2048 in order to increase the default compression potential. 
> Other advantages are reducing partial aggregation, increasing the applicability of physical operators with blocksize constraints, and reducing the overhead for ultra-sparse matrices.



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