Color management difference when using multiple and different GPUs together #52107

New Issue

Maxime Michel · 2017-07-18T14:12:06+02:00

Maxime Michel commented

2017-07-18 14:12:06 +02:00

System Information
Windows 10 64-bits
Intel Core i7-2600K
CUDA Rendering with GTX 560 Ti (sm_21) and GTX 780 (sm_35)

Blender Version
Broken: latest builds from Blender Buildbot, GraphicAll.org, and my own compiled builds (all of them 2.78.5)
Worked: official 2.78.1 release

Short description of error

I tried to use my older GTX 560 Ti with my GTX 780 to get faster renders, but I encountered this strange behavior when combining them: [Picture here ]], [ http:*i.imgur.com/6kzMT8l.jpg | Another example
I thought that the different CUDA kernels (sm_35 and sm_21) were the cause of this weird tiling effect. However, this does not happen when I use only one GPU at a time (and I get exactly the same results for both GPUs, no problem).

May have something to do with color management when using multiple GPUs, the problem disappears when I mute the Image texture node here: rouleaustarwars.blend

Original post @Blender StackExchange

**System Information** Windows 10 64-bits Intel Core i7-2600K CUDA Rendering with GTX 560 Ti (sm_21) and GTX 780 (sm_35) **Blender Version** Broken: latest builds from Blender Buildbot, GraphicAll.org, and my own compiled builds (all of them 2.78.5) Worked: official 2.78.1 release **Short description of error** I tried to use my older GTX 560 Ti with my GTX 780 to get faster renders, but I encountered this strange behavior when combining them: [Picture here ]], [[ http:*i.imgur.com/6kzMT8l.jpg | Another example ](https:*i.stack.imgur.com/98xSX.jpg) I thought that the different CUDA kernels (sm_35 and sm_21) were the cause of this weird tiling effect. However, this does not happen when I use only one GPU at a time (and I get exactly the same results for both GPUs, no problem). May have something to do with color management when using multiple GPUs, the problem disappears when I mute the Image texture node here: [rouleaustarwars.blend](https://archive.blender.org/developer/F670832/rouleaustarwars.blend) Original post [@Blender StackExchange ](https://blender.stackexchange.com/questions/84747/hue-difference-when-using-multiple-and-different-gpus-together)

Maxime Michel commented

2017-07-18 14:12:06 +02:00

Changed status to: 'Open'

Maxime Michel commented

2017-07-18 14:12:06 +02:00

Added subscriber: @maximemichel

Maxime Michel changed title from ~~Hue difference when using multiple and different GPUs together~~ to Color management difference when using multiple and different GPUs together

2017-07-18 14:12:36 +02:00

Brecht Van Lommel commented

2017-07-18 14:36:40 +02:00

Added subscribers: @Stefan_Werner, @brecht

Brecht Van Lommel commented

2017-07-18 14:36:40 +02:00

@Stefan_Werner, I'm guessing this is due to ec25060a0, mixing cases with bindless texture support and not. Not sure if there's a good way to make this work.

@Stefan_Werner, I'm guessing this is due to ec25060a0, mixing cases with bindless texture support and not. Not sure if there's a good way to make this work.

Stefan Werner commented

2017-07-19 14:02:10 +02:00

The attached scene is missing its textures. Can you please pack them and upload it again?

Stefan Werner commented

2017-07-19 14:31:29 +02:00

@brecht You're probably right. I think it needs to use the same texture IDs for all CUDA architectures and then map back to SM_2x on the kernel side. I'll go dig out my GTX 460...

Maxime Michel commented

2017-07-19 14:54:33 +02:00

Sorry I forgot to pack the textures indeed, should be okay now: rouleaustarwars.blend

Sorry I forgot to pack the textures indeed, should be okay now: [rouleaustarwars.blend](https://archive.blender.org/developer/F671862/rouleaustarwars.blend)

Stefan Werner self-assigned this 2017-07-20 09:19:49 +02:00

blender-admin commented

2017-07-20 10:03:27 +02:00

This issue was referenced by blender/cycles@ebe981d932

This issue was referenced by blender/cycles@ebe981d9327488670d596ff3e8ec9a45d5b00a2b

blender-admin commented

2017-07-20 10:03:27 +02:00

This issue was referenced by 4bc6faf9c8

This issue was referenced by 4bc6faf9c838084b23740c8749759f0c0b956c2b

Stefan Werner commented

2017-07-20 10:03:37 +02:00

Changed status from 'Open' to: 'Resolved'

Stefan Werner closed this issue

2017-07-20 10:03:37 +02:00

Stefan Werner commented

2017-07-20 10:04:51 +02:00

@maximemichel if you could please verify that this is fixed with the upcoming automated builds.

Maxime Michel commented

2017-07-20 11:45:25 +02:00

I can't get the kernel to be compiled :

ptxas fatal   : More than 128 textures used in entry function 'kernel_cuda_branched_path_trace'

Full log here

I can't get the kernel to be compiled : ``` ptxas fatal : More than 128 textures used in entry function 'kernel_cuda_branched_path_trace' ``` Full log [here ](https://pastebin.com/iyba1JJU)

Steffen Dünner commented

2017-07-20 11:52:47 +02:00

Added subscriber: @SteffenD

Steffen Dünner commented

2017-07-20 11:52:47 +02:00

In #52107#447031, @maximemichel wrote:
I can't get the kernel to be compiled :
ptxas fatal   : More than 128 textures used in entry function 'kernel_cuda_branched_path_trace'

Same here. Win10 x64

> In #52107#447031, @maximemichel wrote: > I can't get the kernel to be compiled : > ``` > ptxas fatal : More than 128 textures used in entry function 'kernel_cuda_branched_path_trace' > ``` Same here. Win10 x64

Stefan Werner commented

2017-07-20 13:14:28 +02:00

Thanks, will take another look. Give me a couple of minutes.

Maxime Michel commented

2017-07-20 13:30:33 +02:00

Will test your new commit ASAP ;)

Stefan Werner commented

2017-07-20 13:41:46 +02:00

Should be working in c1ca3c8.

Should be working in c1ca3c8.

Maxime Michel commented

2017-07-20 15:20:08 +02:00

Seems to be working fine now! Thanks a lot ;)

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Color management difference when using multiple and different GPUs together #52107