GPU not really being used in renders....
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With 100% CPU use it does sound unlikely that the GPU is being used (assuming you don't have CPU enabled in the Advanced tab of Render Settings) but how are you getting those stats? Windiows Task Manager's process list is not helpful.
What are your exact versions for DS (Help>ABout Daz Studio) and nVidia driver (right-click on desktop>nVidia Control Panel)?
Im using nVidia studio driver 460.89 and Daz studio 4.14.0.10 Pro. Got my stats from the task manager under the performance tab. I had the CPU box checked but now its unchecked and it seems to still be using 100% of the CPU. Its using my 3060ti a bit more but not at 100%. FYI Im using 2 GPU, the other one is a 1060
If you do a render, then go to Help>Troubleshooting>View Log File then the very end should give details of which devices were used in rendering.
Ok so I just finished a render and this was my log at the end...
2020-12-21 17:57:27.950 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Device statistics:
2020-12-21 17:57:27.958 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CUDA device 0 (GeForce RTX 3060 Ti): 696 iterations, 4.779s init, 9999.719s render
2020-12-21 17:57:27.958 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CUDA device 1 (GeForce GTX 1060 6GB): 0 iterations, 0.719s init, 0.000s render
So it looks as if the 3060Ti is being used but the 1060 is dropping out - probably not surprising as its 6GB of RAM will be loaded with a chunk of RTX-emulating code, which the 3060Ti doesn't need.
Ok now that Im trying to render, I get the blank black render...
2020-12-21 20:32:20.457 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(353): Iray [ERROR] - IRAY:RENDER :: 1.0 IRAY rend error: No device specified or usable
2020-12-21 20:32:20.461 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering with 0 device(s):
2020-12-21 20:32:20.461 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering...
2020-12-21 20:32:20.461 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(353): Iray [ERROR] - IRAY:RENDER :: 1.0 IRAY rend error: No worker to render with: aborting render
2020-12-21 20:32:20.461 Iray Render error: Internal rendering error.
There are the errors I got
I have the exact same version of DAZ + nvidia drivers on a rtx 3090 and I'm experiencing no problems whatsoever. Maybye try to do a clean driver install? Re-download the lastes drivers, and upon installing them choose "Advanced options" and check "perform a clean install". Remember that your GPU has 8GB of memory in total, but due to IRAY needing some additional memory for it's internal stuff you'll get ~6.8GB of "real", usable memory. If you your scene exceeds that, it will drop the render to CPU.
Ive reinstalled nVidia driver and still same issues. Gave me the same error codes as before. I even tried to render in the public build beta but just get black screen render
Honestly very annoyed at this point.
Try removing the GTX 1060
Removed my 1060 gpu. It seem to work for one render but after that, just black render screens. Decided to have my CPU and my 3060ti split the render load. Until I get another GPU Im going to leave it like that
DARN! Turns out you may not be doing anything wrong! Got the same bloody problem today! I was using a custom batch rendering script which worked like a charm in DAZ 4.11 and 4.12. around 20 scenes to render, 10 of them rendered, others came out black, despite having tons of VRAM available (RTX 3090, top usage with these scenes were ~11GB VRAM), Iray just dropped to CPU and didn't render anything...
2020-12-24 10:17:36.090 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(353): Iray [WARNING] - POST:RENDER :: 1.0 POST rend warn : denoiser is not available on CPU and will be disabled.
2020-12-24 10:17:36.090 Iray [INFO] - POST:RENDER :: 1.0 POST rend info : Postprocessing denoiser is enabled
2020-12-24 10:17:36.091 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating geometry.
2020-12-24 10:17:36.091 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating motion transforms.
2020-12-24 10:17:36.091 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Importing scene graph.
2020-12-24 10:17:36.091 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Importing geometry for motion time 0
2020-12-24 10:17:36.292 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Geometry import (1 triangle object with 671k triangles, 0 fiber objects with 0 fibers (0 segments), 1 triangle instance yielding 671k triangles, 0 fiber instances yielding 0 segments) took 0.200s
2020-12-24 10:17:36.294 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating materials.
2020-12-24 10:17:36.310 Iray [INFO] - MATCNV:RENDER :: 1.0 MATCNV rend info : found 259 textures, 0 lambdas (0 unique)
2020-12-24 10:17:36.315 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Emitter geometry import (7 light sources with 52700 triangles, 1 instance) took 0.001s
2020-12-24 10:17:36.315 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating environment.
2020-12-24 10:17:36.406 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating backplate.
2020-12-24 10:17:36.409 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating lens.
2020-12-24 10:17:36.409 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating lights.
2020-12-24 10:17:36.409 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating object flags.
2020-12-24 10:17:36.409 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating caustic portals.
2020-12-24 10:17:36.409 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating decals.
2020-12-24 10:17:36.438 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Using iray core convergence estimate.
2020-12-24 10:17:36.441 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Allocating 1-layer frame buffer
2020-12-24 10:17:36.473 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Using batch scheduling, caustic sampler disabled
2020-12-24 10:17:36.473 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Initializing local rendering.
2020-12-24 10:17:36.481 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(353): Iray [ERROR] - IRAY:RENDER :: 1.0 IRAY rend error: No device specified or usable
2020-12-24 10:17:36.482 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering with 0 device(s):
2020-12-24 10:17:36.482 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering...
2020-12-24 10:17:36.482 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(353): Iray [ERROR] - IRAY:RENDER :: 1.0 IRAY rend error: No worker to render with: aborting render
2020-12-24 10:17:36.482 Iray Render error: Internal rendering error.
Is this an IRAY issue, or perhaps a driver issue? I'm using Studio Driver 460.89
OK, I have figured something out - Are you using Iray Section Planes? If yes, try to delete it from the scene, save the scene, close/open DAZ and re-render. Worked for me... not really a solution, but at least I know the source of the problem.
How do you delete the Iray section planes?
Wait my scene doesnt have a Iray section plane.....
Pull out your GPU and make sure it's seated properly when you put it back in.
I found a solution to this problem that worked for me. In windows 10, go to SETTINGS and type "graphics settings." Now, turn Hardware accelerated GPU scheduling ON. Inside DAZ Studio, make sure to uncheck CPU in both devices boxes in the advanced tab. Also, uncheck "allow CPU fallback" at the bottom.