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From "Avery Ching (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-185) Improve concurrency of putMsg / putMsgList
Date Mon, 23 Apr 2012 19:26:34 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13259859#comment-13259859
] 

Avery Ching commented on GIRAPH-185:
------------------------------------

About the sent messages, it is the superstep sent messages =).  Therefore if you are looking
at the last superstep, there are 0 sent messages.  If the supersteps are long enough, you
will see this number change per superstep.

Pre-population is certainly appears to be a tradeoff of memory vs performance.  Can you run
a few experiments to justify the tradeoff?
                
> Improve concurrency of putMsg / putMsgList
> ------------------------------------------
>
>                 Key: GIRAPH-185
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-185
>             Project: Giraph
>          Issue Type: Improvement
>          Components: graph
>    Affects Versions: 0.2.0
>            Reporter: Bo Wang
>            Assignee: Bo Wang
>             Fix For: 0.2.0
>
>         Attachments: GIRAPH-185.patch
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> Currently in putMsg / putMsgList, a synchronized closure is used to protect the whole
transientInMessages when adding the new message. This lock prevents other concurrent calls
to putMsg/putMsgList and increases the response time. We should use fine-grain locks to allow
high concurrency in message communication.

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