[Bf-cycles] 2.64 significantly slower than 2.63?

Brecht Van Lommel brechtvanlommel at pandora.be
Sun Oct 28 00:03:29 CEST 2012


It's on my todo list to look into. I didn't see such big regressions
when testing though, but the problem with CUDA is that there we are
also fighting GPU limits, adding more features makes things slower.

Brecht.

On Sat, Oct 27, 2012 at 11:24 PM, Cal McGaugh <cal at cal3d.com> wrote:
>
>
> Hi,
>
> this is an update to my previous email (below)
>
> Has anyone noticed that 2.64 64bit GPU renders are slower than 2.63 64bit
> GPU? Or is it some quirk on of my system?
>
> EVGA GTX460 2GB (with latest driver)
>
> Compared 3 builds/releases of Blender 2.64 using these benchmarks:
>
> #1
> http://blenderartists.org/forum/showthread.php?239480-2-61-Cycles-render-benchmark&highlight=benchmark
>
> #2  http://benchmark.cd3dtech.com/Benchmark/benchmark.html
>
>
>
> 2.63a r46461:46487M                     6:22            1:13
>
> "Fastest CUDA" r51640                   8:15            1:37
>
> Blender.org 2.64a  r51232              8:08            2:01
>
> Buildbot.com r51641                        8:16            1:37
>
> Note,  rendered 1x1 tiles per Adriano Oliveira's suggestion for faster
> time......8x8 rendered in 14min 22sec.
>
> Please let me know if this is a known issue, or if you need me to test more
> builds/releases.
>
> Thanks,
> Cal  McGaugh
>
> www.blenderportal.com
>
>
>
>
>
>
>
>
> ---------- Original Message ----------
> From: Cal McGaugh <cal at cal3d.com>
> To: bf-cycles at blender.org
> Date: October 23, 2012 at 6:18 PM
> Subject: Cycles 2.64 GPU 2X slower???
> Hi,
>
>
> using this benchmark,   Cycles 2.64 r51291-mingw64  renders in 14min 22sec
>
> Cycles 2.64 2.64.5 "Fastest build (All CUDA kernels)  renders in 14min
> 58sec.
>
> But 2.63 r46461:46487M renders in 6min 22sec .........what's up???
>
> Just thought someone should know about it.
>
> Cheers,
> Cal
>
>
>
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>


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