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multiple graphics contexts hurting performance?


 
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Joe Lyga
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PostPosted: Fri Oct 31, 2008 4:16 pm    Post subject:
multiple graphics contexts hurting performance?
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Hi osg-users,

I'm having another issue with my four monitor setup with 2 graphics
cards. Now that I'm running Windows XP, I'm past the OS/Driver issue
that was slowing down both osg-viewer and my program when it was being
displayed in one graphics context across all four monitors. However,
now I'm having a problem when trying to run with more than one
graphics context.

My machine is running Windows XP that has two Geforce 8800 GTX
graphics cards. I'm running these cards with SLI disabled so I can
hook up 4 monitors, with 2 on each graphics card. I have my 4
monitors aligned side by side in display properties, each set to 1400
x 1050 resolution. I have vsync turned off.

Anyway, when I'm running in one 5600 x 1050 graphics context (which is
across all four monitors), I'm getting around 140 frames per second
<see first screenshot>.

If I switch it so there are two 2800 x 1050 graphics contexts, the
performance drops to around 14 frames per second. Also, the draw and
gpu reads almost 10 times what it did with a single context <see
second screenshot>.

Does anyone have any insight on why two graphics contexts would be
slowing down my program?



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