Hi Tugkan,
I haven't done a lot of performance testing, it wouldn't surprise me if
a single window had the same or better performance than two or more. The
target market for SLI is the gaming community and 'surround' or
'immersive' gaming is being adopted with nauseatingly wide fovs in
single windows.
But I did notice two things: My cpu cores are nowhere near maxing out
(lucky if they get to 30%) when the rendering is crawling.
The other one, and I have to confess I don't have experience of the
Linux driver, is interesting in that 'Enabling SLI multi GPU' does not
automatically enable 'Multi GPU rendering'. I have a further option in
'Enable SLI Rendering Mode' of 'SLI Single GPU rendering', 'SLI Multi
GPU rendering' or 'SLI Antialiasing'. This was news to me and I found
whole load more frames coming from somewhere after I said, yes of
course... use both! I thought this was worth sharing as I had missed it
somehow. Again, the driver doesn't feel that optimised to me as a scene
with vertical sync on has the upper frame limit divided by the number of
windows (20hz)?? (when vertical sync off and a single window will scream
up to ~1500hz)
Cheers
Garry
From: Tugkan Calapoglu <tugkan_at_vires.com>
Date: Mon Aug 21 2006 - 07:17:21 PDT
With similar setups I get multiple threads running but I couldn't see
any performance improvement. Indeed it got much worse. With or without
SLI the result is the same. Maybe it is a Linux issue. Or maybe I have
to redo the tests.
--
Garry Keltie
garrydotkeltieATrmit.edu.au
VR Centre - Research & Innovation
RMIT University
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