[eq-dev] Loose of performance when adding more nodes

[Stefan Eilemann]

On 12. Aug 2009, at 10:55, tgp wrote:

> I'm working with a little bit modified version of eqOSG, maybe is  
> something
> related to OSG?
>
> The weird thing is that after adding shadow maps (some more pass  
> thru the
> pipe) to the program
> I noticed that when I execute it on the cluster it runs slower than  
> when I
> run it on the main
> node (the one with the 8600GT) without turning on the eqServer.

[snip]

You are using scalability between the nodes. Shadowing is a global  
operation, that is, each source channel has to render the full shadow  
map. Unless addressed specifically, this kills performance since the  
rendering is no longer parallelizable.

Remark 1: Why don't you simple use a multi-view config, where each  
node only renders for itself (similar to hactar.eqc)
Remark 2: If you need scalability, configure it like 5-pipe.cave.lb.eqc


HTH,

Stefan.