[Bf-cycles] Render tiles in GPU vs CPU

[Cal McGaugh]

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.

Thanks,
Cal




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
> 
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