Hi Don,
 
did this used to work on SGI's from the mid 90's?
This extension provides the capability to synchronize the buffer swaps
>  of a group of GLX drawables.  A swap group is created, and drawables are
>  added as members to the swap group.  Buffer swaps to members of the swap
>  group will then take place concurrently.
Perhaps the chaps who authored the above work for NVidia now? ;-)
 
Just for your record I get the same identical performance drop factor using Coin3D Inventor
SoQt app on a QuadroFX3500 - so it does indeed seem to be down at the driver level. The
frame stats are an exact division of number of windows to monitor retrace.
 
Colin.
----- Original Message -----
From: Don Burns
Sent: Wednesday, October 18, 2006 2:08 PM
Subject: Re: [osg-users] Multi-window performance

I'm trying to raise the issue with NVidia, but so far I haven't gotten a resonse from my contacts over there. 

Just so you are not stuck, the work around, of course, is to use a single window with multiple viewports.  However, this may not work for everyone, especially if you are embedding several windows in different parts of a GUI, or need your viewports to be in non-contiguous space on the screen.

-don

On 10/18/06, Sebastian Olsson <[EMAIL PROTECTED]> wrote:
Don Burns wrote:
> The issue is two windows on one card, single threaded.  This should
> _not_ cause the performance to drop to 30 hz., but it does...

I can just confirm that the same thing happens here... Running single
threaded on Quadro FX and winXP I get 30hz with two windows. And in my
case I need four windows...leaving me with just 15hz...

/Seb

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