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