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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2018/02/17 04:10:00 UTC
[jira] [Closed] (SYSTEMML-2147) Performance read of short and wide
sparse matrices
[ https://issues.apache.org/jira/browse/SYSTEMML-2147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matthias Boehm closed SYSTEMML-2147.
------------------------------------
Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.1
> Performance read of short and wide sparse matrices
> --------------------------------------------------
>
> Key: SYSTEMML-2147
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2147
> Project: SystemML
> Issue Type: Bug
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Priority: Major
> Fix For: SystemML 1.1
>
>
> Since for sparse matrix reads of many columns we synchronize over the first row of a row of blocks, there is unnecessary contention with many read threads and a small number of rows (e.g., 10K rows -> 10 blocks, but 24 threads reading)
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