Gaffer Arnold Multi GPU Support

[Ashutosh Suman]

Hello, can anybody confirm if GafferHQ supports multiple GPU rendering on Arnold.
I have two RTX 4090 on my workstation but it only utilizes one GPU[0] while rendering. 

[John Haddon]

I don't have two GPUs to test with, but I assumed that this would "just work". I'll ask the Arnold devs if we need to do anything special to make it happen...

On Thu, Jan 9, 2025 at 10:51 AM Ashutosh Suman <ashutos...@gmail.com> wrote:

Hello, can anybody confirm if GafferHQ supports multiple GPU rendering on Arnold.
I have two RTX 4090 on my workstation but it only utilizes one GPU[0] while rendering. 

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[Ashutosh Suman]

Hello John, Thank you for the reply. Since the last time I posted the query, we have tested this on the multiple scene file and it turns out that arnold is deciding to use single gpu or multiple gpu based on how computational extensive the file is.

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[John Haddon]

Thanks for the update. If you think there's anything fishy going on, then the Arnold devs suggest sending some logs, which should help us to understand the decisions Arnold is making about the GPU devices.

Cheers...

John

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[William Eguienta]

Tested on 8 gpu machine, it’s works nicely with all gpu on a single frame or a frame per gpu

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