Bhaskar Devireddy created MAHOUT-1001:
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Summary: 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
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.
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