Hi Gabriel,
Gabriel Cirio wrote:
>
> we are working on a OpenSG cluster application with 4 servers and 1
> client. We are experiencing delays in the rendering nodes. It seems like
> the changelist is not being transfered immediately to the rendering
> nodes, since every change made to the client's scene graph takes an
> average of 10 seconds (depending on the size of the geometry loaded at
> the initialization on the client) to be drawn by the servers. For
> smaller geometry files, the delay does not exist and the system runs
> smoothly. Sometimes with the larger geometry files the servers seem to
> "catch up" with the client, reducing the delay progressively until it
> disappears and the system also runs smoothly. Moreover, the delay is
> different for all rendering nodes: one will display the changes at a
> given time, then another, then the first one will change again a little
> bit more, then a third node will catch up, etc, etc.
Hm, I haven't heard of that kind of behavior before. The catching up could be
the initial caching of geometry that becomes visible for the first time. Does
the catching up happen only when you move or is it faster when you stay still?
How big are the models that you're using?
> We are using multicast with a ClusterWindow on the client side, and a
> ClusterServer+PassiveWindow on the servers. Has anybody experienced a
> similar behavior?
Nope, not that I know of.
> We would also be interested in having a blocking mechanism between all
> computers (the client and all the servers) on each frame, before the
> draw routine, like a barrier but among the cluster. Does OpenSG have
> such a mechanism?
The ClusterWindow doesn't do that. It's really more meant as a base class, not
so much for end-user apps. Those should use a MultiDisplayWindow or one of the
other derived Windows, which have that mechanism built in.
Hope it helps
Dirk
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