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https://issues.apache.org/jira/browse/MAHOUT-1591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052106#comment-14052106
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Xiaomeng Huang commented on MAHOUT-1591:
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I think this is a obvious performance improvement.
And I am working on this.

> Parallel job in recommendation
> ------------------------------
>
>                 Key: MAHOUT-1591
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1591
>             Project: Mahout
>          Issue Type: Improvement
>            Reporter: Xiaomeng Huang
>
> Now all job in recommendation are sequential. But some jobs are not depend on 
> the previous job. For example, in PreparePreferenceMatrixJob.java, the input 
> of job itemIDIndex and toUserVectors are same. So they can run concurrently. 
> And so as RowSimilarityJob.java.



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