Hello Jinghua,
That sound weird. Are you sure the problem is not with one of your
machines?
I think you should figure out first where is your performance
bottleneck, and
why this happens. You could try following and write back what you will
get:
1) remove all compositing paths, i.e. leave only rendering. As all
nodes will
render the same amount of data without compositing it should not
really
matter how many you use - 4 nodes for 1 Gb or 8 nodes for 2 Gb.
Speed
should remain roughly the same as there is no pictures transferred.
2) try to split config in to two independent parts - i.e. 4 nodes for
first
1 Gb of data, another 4 nodes for second Gb, without final
compositing of
this two parts. Again, it should be symmetric and speed shouldn't
change
much.
3) if in the second path you will get your 10-12 fps, than just try to
combine
those results in one additional compositing on top.
Best regards,
Makhinya Maxim
On Feb 16, 2009, at 4:01 PM, jinghua wrote:
>
> Dear Stefan,
>
> I have tried Equalizer's eVolve volume renderer to render a
> 1kx1kx2k, ubyte
> volume over a remote 8-node cluster. I have changed the evolve code
> and
> shader to read in the original volume with one byte per voxel, and
> it all
> worked fine. My cluster has a Nvidia GeForce-9500 card with 1G
> memory on
> each node, and infiband private network among the nodes. I used
> direct send
> compound. Each node get 1kx1kx256 subvolume. Each node renders the
> 256M
> volume locally at 16-20fps. When I used 4nodes to render the 1G
> volume, the
> overall performance is about 10-12 fps. But when I used 8nodes to
> render the
> whole 2G volume, the frame rate drops down to 2fps. I have tried to
> use both
> DB and direct send compound, with ethernet and IB network, it's all
> very
> consistent 2fps performance. Are there something I can do to improve
> the
> performance? Thanks a lot!
>
> Jinghua http://n2.nabble.com/file/n2335264/test-8node.res.infi
> test-8node.res.infi
>
> Attached is my config file.
> --
> View this message in context:
> http://n2.nabble.com/eVolve-render-2G-volume-on-8nodes-at-2fps-tp2335264p2335264.html
> Sent from the Equalizer - Parallel Rendering mailing list archive at
> Nabble.com.
>
>
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>
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