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https://issues.apache.org/jira/browse/SYSTEMML-2147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-2147.
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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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