[Bf-cycles] CUDA Toolkit 6.5 and Volume on GPU

[Matthew Heimlich]

I'll test on a 780ti this evening
On Aug 21, 2014 7:20 PM, "Thomas Dinges" <blender at dingto.org> wrote:

> Heads up regarding memory usage (tested with GPU-Z):
> Vanilla Master with CUDA 6.0 and 6.5 are roughly the same (69 vs. 71
> Megabyte for a default cube).
>
> With Volume (__VOLUME__ and __VOLUME_SCATTER) enabled the kernel needs
> additional 15 Megabyte (85 Megabyte for the default cube). I think that
> is a reasonable price for Volume support on GPU.
>
> @Zanqdo: When compiling with SSS we still have a much larger memory
> footprint, 148 Megabyte in a quick test, don't think we can enable this
> soon.
>
> @all
> I can only test sm_21. sm_20, 30, 35 and 50 will be interesting too. If
> you compile yourself, you could help me here.
>
> Test Render Time and Memory Usage with CUDA Toolkit 6.5.
> 1) Vanilla
> 2) __VOLUME__ enabled
> 3) __VOLUME__ and __VOLUME_SCATTER__ enabled.
>
> These 2 options can be enabled in cycles/kernel/kernel_types.h, lines
> 80/81.
>
> Best regards,
> Thomas
>
> Am 21.08.2014 um 23:54 schrieb Thomas Dinges:
> > Hi everyone,
> > NVIDIA just released the CUDA Toolkit 6.5:
> > https://developer.nvidia.com/cuda-toolkit
> >
> > I recommend an update for 2 reasons:
> > 1) It improves rendering performance.
> > 2) It now supports Visual Studio 2013, so no other VS or SDK
> > installations are needed anymore on Windows.
> >
> > I ran some benchmarks on Windows 7 x64, with a Geforce 540M (sm_21),
> > master 2e5e1e2.
> > - cornell_box.blend (256x256 Tiles, 100 Samples)
> > - bmw.blend (128x128 Tiles, 100 Samples)
> >
> > 1) Master (Vanilla) with Toolkit 6.0
> > - cornell: 57.47s
> > - bmw: 1:53.63min
> >
> > 2) Master (Vanilla) with Toolkit 6.5
> > - cornell: 54.10s
> > - bmw: 1:50.10min
> >
> > 3) Master (with __VOLUME__) with Toolkit 6.5
> > - cornell: 56.15s
> > - bmw: 1:52.51min
> >
> > 4) Master (with __VOLUME__ and __VOLUME_SCATTER__) with Toolkit 6.5
> > - cornell: 56.99s
> > - bmw: 1:54.37min
> >
> > I think we have 2 choices after the CUDA Toolkit upgrade:
> > 1) Keep feature set as is, benefit from better performance
> > 2) Enable Volume (and Volume Scatter) on GPU, performance stays roughly
> > the same
> >
> > Best regards,
> > Thomas
> >
> >
> >
> >
> > _______________________________________________
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> > Bf-cycles at blender.org
> > http://lists.blender.org/mailman/listinfo/bf-cycles
>
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