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https://issues.apache.org/jira/browse/MAHOUT-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404314#comment-13404314
]
Hudson commented on MAHOUT-1035:
--------------------------------
Integrated in Mahout-Quality #1565 (See
[https://builds.apache.org/job/Mahout-Quality/1565/])
MAHOUT-1035 Hotspot in recommenditembased – UnsymmetrifyMapper job
(Revision 1355573)
Result = SUCCESS
ssc : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1355573
Files :
*
/mahout/trunk/core/src/main/java/org/apache/mahout/math/hadoop/similarity/cooccurrence/RowSimilarityJob.java
*
/mahout/trunk/core/src/main/java/org/apache/mahout/math/hadoop/similarity/cooccurrence/Vectors.java
> Hotspot in recommenditembased – UnsymmetrifyMapper job
> ------------------------------------------------------
>
> Key: MAHOUT-1035
> URL: https://issues.apache.org/jira/browse/MAHOUT-1035
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.7
> Reporter: Bhaskar Devireddy
> Assignee: Sebastian Schelter
> Priority: Minor
> Fix For: 0.8
>
> Attachments: MAHOUT-1035.patch, patch_1035.patch,
> patch_1035_ver2.patch
>
>
> While profiling the unsymmetrify mapper job in recommendations we noticed an
> hotspot consuming 90% of the CPU runtime in
> org.apache.mahout.math.map.OpenIntDoubleHashMap.keys method for the first map
> task. We used the script provided in mahout examples for running ASF Email
> recommendations for profiling. The attached patch addresses the hotspot by
> reducing the number of for loop iterations in OpenIntDoubleHashMap.keys
> method by changing the initialization of transposedPartial. This patch while
> retaining functionality(verified the output with and without patch) speeds up
> the unsymmetrify mapper task by more than 4X on x86 architectures.
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