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From "Tommaso Teofili (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-732) Investigate the usage of Apache DirectMemory to store vertices
Date Tue, 12 Feb 2013 09:15:13 GMT

    [ https://issues.apache.org/jira/browse/HAMA-732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576478#comment-13576478
] 

Tommaso Teofili commented on HAMA-732:
--------------------------------------

maybe we can have something like custom Hama cache module so that we're not bound to DM /
off-heap caching.
There're different kind of serializers in DM (see http://svn.apache.org/repos/asf/directmemory/trunk/serializers/)
and the number of allocated buffers is defined by configuration of CacheService by using DirectMemory
(see http://svn.apache.org/repos/asf/directmemory/trunk/directmemory-cache/src/main/java/org/apache/directmemory/DirectMemory.java)
                
> Investigate the usage of Apache DirectMemory to store vertices
> --------------------------------------------------------------
>
>                 Key: HAMA-732
>                 URL: https://issues.apache.org/jira/browse/HAMA-732
>             Project: Hama
>          Issue Type: Improvement
>          Components: graph
>    Affects Versions: 0.6.0
>            Reporter: Tommaso Teofili
>            Assignee: Tommaso Teofili
>            Priority: Minor
>             Fix For: 0.7.0
>
>         Attachments: HAMA-732.patch
>
>
> Since Apache DirectMemory can keep objects outside of the java heap that could help on
improving performances.
> I created a simple extension implementation of VerticesInfo which uses Apache DirectMemory
CacheService instead of a List, performance seem to be improved.

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