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From "Maja Kabiljo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-357) Don't try to combine if there is only one message
Date Fri, 05 Oct 2012 17:24:02 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470482#comment-13470482
] 

Maja Kabiljo commented on GIRAPH-357:
-------------------------------------

Yes, it helps only when there is one message, but when you have large number of vertices that's
almost always the case because of flushing.

I will try out not combining all the time and report back if I get any visible improvement.
                
> Don't try to combine if there is only one message
> -------------------------------------------------
>
>                 Key: GIRAPH-357
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-357
>             Project: Giraph
>          Issue Type: Improvement
>            Reporter: Maja Kabiljo
>            Assignee: Maja Kabiljo
>         Attachments: GIRAPH-357.patch
>
>
> In SendMessageCache, we call combiner even if we have just one message. Combining is
kind of expensive since we recreate the message object and the list. With default settings
and bigger graph, for PageRankBenchmark there is 10-15% superstep speedup if we don't call
it when we have a single message.

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