[Paraview] FPS drop in stereo mode

Tue Jun 18 00:01:57 EDT 2013

Thanks Stephan. The conclusion makes sense as the SplitViewportHorizontal
performs operations on pixels directly. How about the quad buffer stereo?
Can you even do that on GTX card?

- Aashish

On Mon, Jun 17, 2013 at 3:39 AM, Stephan Rogge
<Stephan.Rogge at tu-cottbus.de>wrote:

> Aashish,
>
> I've made another test on my render node [1] and my desktop PC. The
> FPS-drop
> depends on the size of the render viewport. To showcase the drop I ran
> ParaView in the "SplitViewportHorizontal" mode and play a looped animation
> with an empty scene. Then I measured the FPS with three different viewport
> sizes:
>
> Resolution => FPS on render node [1]
> 1617 x 906 => 33 FPS (PV window maximized)
> 1617 x 702 => 45 FPS
> 1617 x 438 => 60 FPS
>
> Resolution => FPS on desktop PC [2]
> 1617 x 906 => 20 FPS (PV window maximized)
> 1617 x 707 => 26 FPS
> 1617 x 292 => 60 FPS
>
> Conclusion: The Quadro performs better within that stereo mode, but has
> also
> a drop of ca. 50 % when the PV window is maximized.
>
> [1] Render node:
> * 2x NVidia Quadro K5000
> * ParaView on git-master (latest)
> * Fraps as FPS-Display
> * Windows 7 64 Bit
>
> [2] Desktop PC:
> * NVidia GeForce GTX 580
> * ParaView on git-master (latest)
> * Fraps as FPS-Display
> * Windows 7 64 Bit
>
> Stephan
>
> Von: Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> Gesendet: Freitag, 14. Juni 2013 16:13
> An: Stephan Rogge
> Cc: ParaView list
> Betreff: Re: [Paraview] FPS drop in stereo mode
>
>
>
> On Fri, Jun 14, 2013 at 9:03 AM, Stephan Rogge <
> Stephan.Rogge at tu-cottbus.de>
> wrote:
> Aashish,
>
> the quad buffer explenation does make sense. But after some more testing
> with the "old" PV version (ParaView_4.0-RC1-51-g2965c8) on a machine with
> *  a NVidia Quadro 5000 and
> * a machine with 2 NVidia Quadro K5000 (SLI),
> I observed a FPS drop in all stereo modes except "Crystal Eyes" which is
> hard to measure with fraps. The FPS overly is not visible in that stereo
> mode.
>
> As you said earlier, the FPS will drop but not as hard as you have seen on
> GTX cards. How does the FPS drop on 5000 compares with the FPS drop on GTX?
>
> When I use "SplitViewportHorizontal" as stereo mode on my Kepler GPUs I can
> see a FPS drop. Interestingly the rate depends on the ParaView's window
> size. The smaller the window is the higher the rate and vice versa. I guess
> that a post process, which copies pixel between buffers, need some more
> time
> for execution. Is it possible?
>
> Yes, that mode  performs the copy between buffers to produce the final
> image.
>
> Regards,
> Stephan
>
> Von: Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> Gesendet: Donnerstag, 13. Juni 2013 17:51
> An: Stephan Rogge
> Cc: ParaView list
> Betreff: Re: [Paraview] FPS drop in stereo mode
>
> Hi Stephan,
> GeForce GTX 580 are not great for stereo rendering as I believe they don't
> support Quad buffered stereo
>  (
> http://3dvision-blog.com/3840-nvidia-with-a-new-high-end-gpu-namely-the-ge
> force-gtx-580/).
> In that case, I believe VTK will perform software stereo implementation and
> that's why your performance will go down quite a bit.
>
> I don't have the latest card but normally the consumer level card don't
> support stereo that well (although this might not be the case with recent
> NVIDIA cards).
>
> Let us know if you find this performance degradation on your Quadro cards
> as
> well with latest paraview.
>
> Thanks,
>
>
> On Thu, Jun 13, 2013 at 11:13 AM, Stephan Rogge
> <Stephan.Rogge at tu-cottbus.de> wrote:
> Aashish,
>
> it doesn't matter which stereo type is activated. I've got only 20 FPS...
> This is tested on GeForce GTX 580. The ParaView version is pulled from
> latest git-master.
>
> Surprisingly, this problem does not occurs on my Render-PC of our
> CAVE-system. There I have 2 K5000 NV Quadro cards. But the code base is
> older (PV RC1), though I have to check it, with an updated code base and
> see, whether this fps drop remains.
>
> Cheers,
> Stephan
>
> Von: Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> Gesendet: Donnerstag, 13. Juni 2013 16:49
> An: Stephan Rogge
> Cc: ParaView list
> Betreff: Re: [Paraview] FPS drop in stereo mode
>
> Hi Stephan,
>
> What particular stereo type you chose for this comparison? Also what
> graphics hardware you have?
>
> Thanks,
>
>
> On Mon, Jun 10, 2013 at 10:47 AM, Stephan Rogge
> <Stephan.Rogge at tu-cottbus.de> wrote:
> Hello,
>
> I observed an unexpected frame rate drop when using one of PV's supported
> stereo modes within an empty scene.
>
> Considering
> * OS: Windows
> * V-Sync: On
> * Application to display FPS (e.g. www.fraps.com)
> * Latest ParaView from git-master
>
> Following steps should emphasizes the frame rate drop:
> 1. Open ParaView without any stereo mode
> 2. Rotate or drag the camera in the 3D view for several seconds and watch
> at
> the frame rate (should be around 60 FPS)
> 3. Close ParaView
> 4. Open ParaView with "--stereo" flag enabled
> 5. Rotate or drag the camera in the 3D view for several seconds and watch
> at
> the frame rate (should be around 22 FPS)
>
> Obviously, stereo rendering should take twice the time of a monocular
> rendering. But this should only occurs in more complex scenes. Can anyone
> reproduce this behavior? Is this a BUG?
>
> Best regards,
> Stephan
>
>
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>
> --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com
>
>
>
>
> --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com
>
>
>
>
> --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com
>
>

-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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