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From "Sean Owen (JIRA)" <>
Subject [jira] [Resolved] (MAHOUT-1001) Performance improvement in recommenditembased
Date Wed, 25 Apr 2012 16:50:18 GMT


Sean Owen resolved MAHOUT-1001.

    Resolution: Fixed

Looks good, I've committed.
> Performance improvement in recommenditembased
> ---------------------------------------------
>                 Key: MAHOUT-1001
>                 URL:
>             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

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