Hi Bryan,
I have similar setup. 8800 GTS Windows XP 32 bit driver version. Drivers
185.85. Default (undefined USE_FBO) osgviewer cow.osg on two 1280x1024
screens runs at 600 hz. When graph stats are turned on (second 's' keypress)
framerate drops to 60-70 hz. When running your modified osgviewer cow.osg I
see empty blue screen (I assume its ok as cow is drawn to FBO). With USE_FBO
results vary depending on multithreading mode: singlethreaded is most
consitent - 300-400 hz. Other modes sometimes run at 700 hz and drop to 60
hz for a second or two to get back to 700 and drop again after few more
seconds. Sometimes its stable at 700 sometimes it starts at 60+ hz. All
tests done only with Hz counter. Invoking graph stats usually drops
framerate below 100hz.
When 'Single display performance' invoked osgviewer runs on one screen in
XP. I suppose you are on Vista because I saw drivers work on both screeens
there.
HTH,
Wojtek Lewandowski
----- Original Message -----
From: "Thrall, Bryan" <[email protected]>
To: "OpenSceneGraph Users" <[email protected]>
Sent: Tuesday, June 09, 2009 5:02 PM
Subject: [osg-users] Multidisplay FBO performance
I have a multiple display system with an NVIDIA 8800 GT (driver version
181.20) that has performance problems when I use FBOs (see attached test
case, modified from osgviewer.cpp). My draw times jump from about 7
milliseconds to 14, and my GPU times jump from less than 1ms to 7ms.
The problem goes away when I switch from "Multiple display performance
mode" to "Single display performance mode" in the NVIDIA Control Panel,
so this looks like a driver bug, but I was wondering if anyone was aware
of this problem and any ways around it (I didn't find any discussion of
such a bug via google)?
I'm running on Windows MSVC 2005 using OSG svn rev 10273.
--
Bryan Thrall
FlightSafety International
[email protected]
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