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From "Craig Muchinsky (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-874) Specialized byte array partitions
Date Tue, 18 Mar 2014 18:01:55 GMT
Craig Muchinsky created GIRAPH-874:
--------------------------------------

             Summary: Specialized byte array partitions
                 Key: GIRAPH-874
                 URL: https://issues.apache.org/jira/browse/GIRAPH-874
             Project: Giraph
          Issue Type: Improvement
          Components: graph
    Affects Versions: 1.1.0
            Reporter: Craig Muchinsky


While doing some performance tuning I discovered that loading byte array partitions was performing
slower than expected. I found that the extra time was being spent allocating a new vertex
object for each distinct vertexId encountered (because vertexId object is the map key). Similar
to GIRAPH-704, the use of primitive maps can provide significant performance benefit in this
situation. By using a primitive map, the vertex object on the VertexIterator can be reused
perpetually because the vertexId object isn't used as the map key.

When processing a large graph with 4B vertices the worker vertices requests were taking ~15
seconds each, but after implementing the above suggestion that number dropped down sub-second.



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