giraph-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Claudio Martella (JIRA)" <>
Subject [jira] [Commented] (GIRAPH-874) Specialized byte array partitions
Date Thu, 22 May 2014 12:04:01 GMT


Claudio Martella commented on GIRAPH-874:

It needs minor refactoring, but this may go in. It's a nice feature, but I would not consider
it a blocker for 1.1.0.

> Specialized byte array partitions
> ---------------------------------
>                 Key: GIRAPH-874
>                 URL:
>             Project: Giraph
>          Issue Type: Improvement
>          Components: graph
>    Affects Versions: 1.1.0
>            Reporter: Craig Muchinsky
>             Fix For: 1.1.0
>         Attachments: GIRAPH-874-2.patch, GIRAPH-874.patch
> While doing some performance tuning I discovered that loading byte array partitions was
performing slower than expected. I found that the extra time was being spent allocating a
new vertex object for each distinct vertexId encountered (because vertexId object is the map
key). Similar to GIRAPH-704, the use of primitive maps can provide significant performance
benefit in this situation. By using a primitive map, the vertex object on the VertexIterator
can be reused perpetually because the vertexId object isn't used as the map key.
> When processing a large graph with 4B vertices the worker vertices requests were taking
~15 seconds each, but after implementing the above suggestion that number dropped down sub-second.

This message was sent by Atlassian JIRA

View raw message