cuda disable openCL on windows #53017

New Issue

mathieu menuet · 2017-10-07T14:55:12+02:00

mathieu menuet commented

2017-10-07 14:55:12 +02:00

System Information
Win7 X64, vega 64 with 17.9.3, 1080TI with 385.69,

Blender Version
Broken: latest master

Short description of error
When cycles is compiled with cubins and an nvidia card is installed, OpenCL is not available in user pref anymore. If it's compiled without cubins, then the OpenCL option is available.

Exact steps for others to reproduce the error
On a PC with windows, and both an AMD and Nvidia card compatible with current cycles and a display connected to them:
compile Blender with "make.bat full", start it : OpenCL option is available.
compile Blender with "make.bat release": only CUDA is available.

**System Information** Win7 X64, vega 64 with 17.9.3, 1080TI with 385.69, **Blender Version** Broken: latest master **Short description of error** When cycles is compiled with cubins and an nvidia card is installed, OpenCL is not available in user pref anymore. If it's compiled without cubins, then the OpenCL option is available. **Exact steps for others to reproduce the error** On a PC with windows, and both an AMD and Nvidia card compatible with current cycles and a display connected to them: compile Blender with "make.bat full", start it : OpenCL option is available. compile Blender with "make.bat release": only CUDA is available.

mathieu menuet commented

2017-10-07 14:55:12 +02:00

Changed status to: 'Open'

mathieu menuet commented

2017-10-07 14:55:12 +02:00

Added subscriber: @bliblubli

Brecht Van Lommel commented

2017-10-08 03:17:06 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2017-10-08 03:17:06 +02:00

Can you attach the output of blender -b --debug-cycles -f 1 (to show the device initialization logs)?

Can you attach the output of `blender -b --debug-cycles -f 1` (to show the device initialization logs)?

mathieu menuet commented

2017-10-08 09:40:57 +02:00

full is made with "make.bat full" = no cubins
release is made with "make.bat release" = with cubins
full.log

release.log

full is made with "make.bat full" = no cubins release is made with "make.bat release" = with cubins [full.log](https://archive.blender.org/developer/F982330/full.log) [release.log](https://archive.blender.org/developer/F982331/release.log)

Brecht Van Lommel commented

2017-10-08 13:12:17 +02:00

For some reason the AMD GPU is not detected after CUDA devices are detected, I can see no code in Cycles itself that does this. I guess it's some internal thing in the graphics driver, where calling cuInit() somehow interferes with the AMD graphics driver?

Perhaps try reordering things in Device::available_devices() so OpenCL devices are initialized before CUDA devices?

For some reason the AMD GPU is not detected after CUDA devices are detected, I can see no code in Cycles itself that does this. I guess it's some internal thing in the graphics driver, where calling `cuInit()` somehow interferes with the AMD graphics driver? Perhaps try reordering things in `Device::available_devices()` so OpenCL devices are initialized before CUDA devices?

mathieu menuet commented

2017-10-08 18:15:39 +02:00

indeed, it works now :) thanks for the solution, I think it's safe for master. Here are the diff we spoke of in IRC:
To allow OpenCL to be selected when CUDA is present:
OpenCL_CUDA.diff
to render all samples at once on OpenCL to limit update overhead, but botleneck is somewhere else when rendering small tiles:
OpenCL_all_samples_once.diff
And the patch you proposed to render with CUDA, OpenCL and CPU together, but only init phase works.
OpenCL_mutli_device.diff

indeed, it works now :) thanks for the solution, I think it's safe for master. Here are the diff we spoke of in IRC: To allow OpenCL to be selected when CUDA is present: [OpenCL_CUDA.diff](https://archive.blender.org/developer/F984475/OpenCL_CUDA.diff) to render all samples at once on OpenCL to limit update overhead, but botleneck is somewhere else when rendering small tiles: [OpenCL_all_samples_once.diff](https://archive.blender.org/developer/F984477/OpenCL_all_samples_once.diff) And the patch you proposed to render with CUDA, OpenCL and CPU together, but only init phase works. [OpenCL_mutli_device.diff](https://archive.blender.org/developer/F984476/OpenCL_mutli_device.diff)

blender-admin commented

2017-10-08 18:20:55 +02:00

This issue was referenced by blender/cycles@eacde5d04a

This issue was referenced by blender/cycles@eacde5d04af23fcc2bc9b88695157b768b1a17ca

blender-admin commented

2017-10-08 18:20:55 +02:00

This issue was referenced by 5aa08eb3cc

This issue was referenced by 5aa08eb3cc7c9c5a6282d938fd2ffa6266a40ff7

mathieu menuet commented

2017-10-08 18:21:53 +02:00

It seems the multi-device patch works when CPU is not selected. Note that in this case, selecting cpu in either the CUDA or OpenCL Tab of user pref activates it in the other one, so maybe it conflicts somehow?

Brecht Van Lommel commented

2017-10-08 18:36:59 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2017-10-08 18:36:59 +02:00

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cuda disable openCL on windows #53017