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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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Bhaskar Devireddy updated MAHOUT-1001:
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Description: 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. (was: 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 cycle.
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.)
> 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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