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From "Avery Ching (Created) (JIRA)" <>
Subject [jira] [Created] (GIRAPH-104) Save half of maximum memory used from messaging
Date Tue, 13 Dec 2011 19:14:30 GMT
Save half of maximum memory used from messaging

                 Key: GIRAPH-104
             Project: Giraph
          Issue Type: Improvement
            Reporter: Avery Ching
            Priority: Critical

Currently, the amount of memory that Giraph uses for messaging is huge.  This JIRA will reduce
the messaging memory by half and provide periodic updates of memory for debugging.  Details
are below:

Refactored RandomMessageBenchmark to an internal vertex class.  Added aggregators to RandomMessagesBenchmark
to track bytes, messages, and time for the messaging.  Adjusted the postSuperstep() to be
called after the flush() for more accurate timings.

Added periodic minute updates for message flushing (which can take a while, especially on
the memory benchmark).  This helps to see how progress is going and gives an ETA.

Memory optimizations include:
- Clear the message list after computation 
- Free vertex messages on the source as the flush is going on 
- TreeMap -> HashMap for VertexMutations
- Sizing the ArrayList properly in transientInMessages

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