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From "Sergey Edunov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-895) Trim the edges in Giraph
Date Tue, 13 May 2014 00:17:16 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995856#comment-13995856
] 

Sergey Edunov commented on GIRAPH-895:
--------------------------------------

Formatting is terrible here, in short:
6% better GC time
7.5% better total time
15% smaller heap size after GC

> Trim the edges in Giraph
> ------------------------
>
>                 Key: GIRAPH-895
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-895
>             Project: Giraph
>          Issue Type: Improvement
>          Components: graph
>    Affects Versions: 1.1.0
>            Reporter: Sergey Edunov
>             Fix For: 1.1.0
>
>         Attachments: GIRAPH-895.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> In many Giraph applications, graphs are immutable, but edges are never trimmed to the
proper size, after input phase. This means that on average we often use 1.5x memory for storing
them. Considering we are often memory bounded, adding an option to trim the edges after the
input phase will help reduce this excess memory usage. For mutable graphs, we can also provide
an option for the same method to be called after each superstep.
> Review request: https://reviews.apache.org/r/21119/



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