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From "Maja Kabiljo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-314) Implement better message grouping to improve performance in SimpleTriangleClosingVertex
Date Wed, 05 Sep 2012 19:07:09 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13449015#comment-13449015
] 

Maja Kabiljo commented on GIRAPH-314:
-------------------------------------

I see. 

So you'll add a combiner in the stage 2?

Out-of-core will be slower, but I'm just curious, have you tried setting giraph.waitForRequestsConfirmation
and giraph.maxNumberOfOpenRequests together with out-of-core messages? 

Maybe once you add a combiner these two options alone could be enough, since in that case
limiting the number of open requests should be somewhat equivalent to amortizing?
                
> Implement better message grouping to improve performance in SimpleTriangleClosingVertex
> ---------------------------------------------------------------------------------------
>
>                 Key: GIRAPH-314
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-314
>             Project: Giraph
>          Issue Type: Improvement
>          Components: examples
>    Affects Versions: 0.2.0
>            Reporter: Eli Reisman
>            Assignee: Eli Reisman
>            Priority: Trivial
>             Fix For: 0.2.0
>
>         Attachments: GIRAPH-314-1.patch, GIRAPH-314-2.patch
>
>
> After running SimpleTriangleClosingVertex at scale I'm thinking the sendMessageToAllEdges()
is pretty in the code, but its not a good idea in practice since each vertex V sends degree(V)^2
messages right in the first superset in this algorithm. Could do something with a combiner
etc. but just grouping messages by hand at the application level by using IntArrayListWritable
again does the trick fine.
> Probably should have just done it this way before, but sendMessageToAllEdges() looked
so nice. Sigh. Changed unit tests to reflect this new approach, passes mvn verify and cluster,
etc.

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