Maja Kabiljo created GIRAPH-357:
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Summary: 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
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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