Hi Jesse,
Jesse Stimpson wrote:
I feel that we're diverging from what I think is most perplexing about
what I'm seeing. When I restrict the process to use less cores, I get
increased rendering performance. This is what leads me to believe there
are some load-balancing issues.
yes, and it would be difficult to see what causes it. Is it OSG, the
OpenGL driver or your OS? Unfortunately there is no magic way to get the
balance right on all hardware combos. You'll just have to experiment and
use what works best in your situation.
Also, if I have the OSG process set to both cores and I run another
single-threaded process in the background, the other process gets
assigned to one core, and OSG rendering speeds up, presumably because it
is being processed mainly on a single core.
you might find this interesting:
http://igoro.com/archive/gallery-of-processor-cache-effects/
I've been playing with the OSG threading models as well. In debug,
SingleThreaded mode seems to run the best on my machine. Is there
documentation on the implications of the threading models?
Not explicitly that I know of. A search in the archives for the long
names should get you some discussions.
If I
understand correctly, "SingleThreaded" means only the rendering is
single threaded, and the database pager is still a separate thread. Is
this right? Are reasons we shouldn't consider using SingleThreaded mode?
No, use whatever works best for you. We are using SingleThreaded for
some of our apps, because they are just a small part of a larger
application and we can't use all the resources in the machine for
rendering. See also this:
http://thread.gmane.org/gmane.comp.graphics.openscenegraph.user/52734
rgds
jp
Thanks,
Jesse
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