[osg-users] Framerate vs stats?

[Robert Osfield]

Hi Wojtek,

Could you try other machines with different OS/OpenGL drivers/hardware
to see if the problem happens elsewhere.

Robert.

On Fri, Feb 15, 2008 at 11:57 AM, Wojciech Lewandowski
<lewandowski at ai.com.pl> wrote:
> Hi Robert,
>
>  We noticed another issue. When statistics bars are on - framerate slowly
>  degrades. This happens with osgviewer dumptruck.osg for example. When stats
>  are on draw time slowly grows and framerate starts to decrease.
>
>  Tested with latest svn (2.3.4), windows xp & vista, OSG built with VS 2008.
>
>  Regards,
>  Wojtek
>
>
>
>
>  ----- Original Message -----
>  From: "Robert Osfield" <robert.osfield at gmail.com>
>  To: "OpenSceneGraph Users" <osg-users at lists.openscenegraph.org>
>  Sent: Friday, February 15, 2008 11:57 AM
>  Subject: Re: [osg-users] Framerate vs stats?
>
>
>  Hi J-S,
>
>  On screen stats adds extra compute and GPU load to the rendering of
>  the frame, so one would expect it reduce rather than enhance frame
>  rate.  The fact that you have an instance where the reverse happens
>  suggest something odd happening with the OpenGL driver - something
>  like is given the boot when the OpenGL data that the OSG send changes
>  slightly.  Try other things to jolt the driver by toggle texturing or
>  lighting to see what happens.
>
>  Robert.
>
>  On Mon, Feb 4, 2008 at 3:31 PM, Jean-Sébastien Guay
>  <jean-sebastien.guay at cm-labs.com> wrote:
>  > Hello all,
>  >
>  >  I'm seeing something peculiar in one of our apps using OSG 2.2, and I
>  >  was wondering if someone else had seen something like this or would have
>  >  an idea what would cause it.
>  >
>  >  The app starts and seems sluggish. Pressing 's' once shows it's running
>  >  at around 15-20 FPS. But then, if I press 's' a second time, the
>  >  framerate shoots up to >75 FPS (capped by my refresh rate) and the app
>  >  is suddenly very smooth. And it stays like that too (I can hide the
>  >  stats again or whatever, it has no significant effect on the frame rate).
>  >
>  >  So, what could cause this? Why would showing the detailed stats screen
>  >  have that effect? I've seen cases where showing detailed stats _slowed_
>  >  the frame rate, but this is the first time it makes it faster!
>  >
>  >  Thanks in advance,
>  >
>  >  J-S
>  >
>  >  --
>  >  ______________________________________________________
>  >  Jean-Sebastien Guay    jean-sebastien.guay at cm-labs.com
>  >                                http://www.cm-labs.com/
>  >                         http://whitestar02.webhop.org/
>  >
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