[Bf-cycles] Req: Access to new branch for rendering on Intel Xeon Phi

Sergey Sharybin sergey.vfx at gmail.com
Sun Jul 23 16:06:55 CEST 2017


The main issue i see here is that there's really a few Blender users who
has Xeon Phi, and yet requesting to support it in Blender itself would mean
complicating release builds (extra compiler etc), and opening can of worms
of extra obscure bug reports on platforms which Blender/Cycles developers
has no access to.

Some questions:
- Last time i looked into ISPC compiler examples, they were requiring
adding some special hints on loops and such for an extra vectorization. Is
that still a case ?
- Is it only Xeon Phi architecture which will benefit from ISPC ?
- AFAIR, Xeon Phi supports OpenCL, did you try that ?
- How's Xeon Phi performance compares to GTX1080 and RX480 ?

As for tile size, details about this better be discussed in separate topic
i think. Otherwise we'll mix too many things in this discussion.

But once again, those are concerns about having this device enabled in
Blender builds. If those are a compile-time option, with minimal changes
outside of device/ and kernel entrypoints i'm not really against extra
devices support.

On Sun, Jul 23, 2017 at 3:32 PM, Jaros Milan <milan.jaros at vsb.cz> wrote:

> Hi,
> I would like to create a new computed devices for Intel Xeon Phi (KNC,
> KNL).
> I used my version of new computed devices for rendering of almost all
> scenes of Agent327 (http://blender.it4i.cz/rendering/agent-327-operation-
> barbershop/).
> You can find more information here: http://blender.it4i.cz/
> research/rendering-on-intel-xeon-phi/
> Now I use Intel compiler but I would like to change it to ISPC open sorce
> compiler.
> I would like to open question about size of tiles for hybrid system
> CPU+CUDA/Phi ( CUDA, OpenCL, OpenMP require bigger tile than CPU ). Sergey
> has the some idea about this.
> Thanks.
> Best regards
> Milan Jaroš
> Research Assistant
> IT4Innovations national supercomputing center
> VŠB – Technical University of Ostrava
> 17. listopadu 15/2172  |   708 33 Ostrava-Poruba   |   Czech Republic
> e-mail: milan.jaros at vsb.cz  |   web: industry.it4i.cz   |   phone:
> +420 597 329 583 <+420%20597%20329%20583>   |    map: goo.gl/maps/BpF0z
> _______________________________________________
> Bf-cycles mailing list
> Bf-cycles at blender.org
> https://lists.blender.org/mailman/listinfo/bf-cycles

With best regards, Sergey Sharybin
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