[jira] [Closed] (SYSTEMML-913) Performance matrix-vector multiplication w/ tall rhs vector

["Matthias Boehm (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SYSTEMML-913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm closed SYSTEMML-913.
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> Performance matrix-vector multiplication w/ tall rhs vector
> -----------------------------------------------------------
>
>                 Key: SYSTEMML-913
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-913
>             Project: SystemML
>          Issue Type: Task
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 0.11
>
>
> So far, we compute matrix-vector multiplication with simple row-wise dot products. This works very well for the common case of tall&skinny matrices, where the right-hand-side vector is very small. However, for scenarios with many features and hence a tall rhs vector, this approach suffers from cache unfriendly behavior. Accordingly, this task tracks the introduction of a dedicated cache-conscious matrix-vector multiplication for both sparse and dense matrices. 



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