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https://issues.apache.org/jira/browse/MAHOUT-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved MAHOUT-1001.
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Resolution: Fixed
Looks good, I've committed.
> Performance improvement in recommenditembased
> ---------------------------------------------
>
> Key: MAHOUT-1001
> URL: https://issues.apache.org/jira/browse/MAHOUT-1001
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.6
> Reporter: Bhaskar Devireddy
> Assignee: Sean Owen
> Fix For: 0.7
>
> Attachments: RowSimilarityJob.patch
>
>
> While running the recommendations with ASFEMail dataset using the example
> script provided with mahout, we noticed that execution time for unsymmetrify
> mapper is very long. While profiling the task we noticed a hotspot consuming
> high CPU cycles. Please find the attached patch addressing issue and
> optimizes the unsymmetrify mapper class. This patch while retaining
> functionality(verified the output with and without patch) speeds up the
> unsymmetrify mapper by more then 5X on x86 architectures.
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