[Bf-cycles] Render tiles in GPU vs CPU

[Daniel Salazar - 3Developer.com]

Speed is only half of the issue here. An HD (or higher) render will take a
lot of memory and can very well crash your GPU rendering if not using
tiles. What works for a couple models is not what works for a complete
scene!

Daniel Salazar
patazstudio.com


On Wed, Nov 7, 2012 at 6:15 PM, Cal McGaugh <cal at cal3d.com> wrote:

> **
>  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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