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Date: Thu, 1 Nov 2012 00:29:12 +0000 (UTC)
From: "Maja Kabiljo (JIRA)" <jira@apache.org>
To: giraph-dev@incubator.apache.org
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Subject: [jira] [Updated] (GIRAPH-397) We should have copies of aggregators
 per thread to avoid synchronizing on aggregate()
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     [ https://issues.apache.org/jira/browse/GIRAPH-397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Maja Kabiljo updated GIRAPH-397:
--------------------------------

    Attachment: GIRAPH-397.patch

I added this as an option (default to use it), for one of our applications with huge aggregators we don't want to use it since we don't want to spend that much memory on having a lot of copies of aggregators. 

Passes verify and AggregatorsBenchmark on cluster.
                
> We should have copies of aggregators per thread to avoid synchronizing on aggregate()
> -------------------------------------------------------------------------------------
>
>                 Key: GIRAPH-397
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-397
>             Project: Giraph
>          Issue Type: Improvement
>            Reporter: Maja Kabiljo
>            Assignee: Maja Kabiljo
>            Priority: Minor
>         Attachments: GIRAPH-397.patch
>
>
> Fixing one of TODOs from GIRAPH-273. Adding copies of aggregators for each thread allows us not to have to synchronize on each aggregate call. Aggregated values from each thread can be aggregated together after computation is finished.

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