[Bf-cycles] Render tiles in GPU vs CPU

Cal McGaugh cal at cal3d.com
Thu Nov 8 01:15:19 CET 2012

Hi Adriano,
very interesting..........no wonder I'm seeing longer renders with 2.64 vs 2.63.

Will do more tests with different versions. Just got a new (used) Zotac GTX580
and will test different tile settings.


On November 7, 2012 at 7:02 PM Adriano Oliveira <adriano.ufrb at gmail.com> wrote:

>  Hi,
>  Subdividing render image in tiles has very inconsistent behavior in CPU and
> GPU: more tiles are good for CPU, BUT less are better for GPU.
>  With my i7, 8x8 is ok. With my GTX 560 Ti, 1x1 is the best. With another dual
> GTX 590 system, I've found 3x3 to be fastest...
>  Problem: with 8x8 as default, non-advised GPU users are experiencing longer
> render times.
>  In last builds, tiles became pixel based, what is not good for GPU users, as
> long as we should now set it up for equal image size and this can change a lot
> for preview. And as strange as it gets, I’ve found that tile size of 1920x1080
> is fast even for a 960x540 render…
>  I think this is getting messy.
>  Adriano A. Oliveira
>  _______________________________________________
>  Bf-cycles mailing list
>  Bf-cycles at blender.org
>  http://lists.blender.org/mailman/listinfo/bf-cycles
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