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Slow rendering for specific model - FG Bistro

mark_z2487mark_z2487 Posts: 112
in Technical Help (nuts n bolts)

I have a reasonably up to date computer, 64 G Ram, RTX 2080 Ti G card

A typical scene, example, plains and mountains with one Gen 9 figure, at 2000 x 1500 pixels will render to 100 percent in about 18 minutes

I have the model, FG Bistro, which looks very nice but takes a very long time to render

An interior rendering at 2000 x 1500 takes around 6 hours!

Does anyone else have this model and this issue?

Is there a particular feature of this model that might be the source of this?

It doesn’t seem to have any fog cubes

It does a have lots of emissive surfaces

Comments

  • felisfelis Posts: 4,189

    This product https://www.daz3d.com/fg-bistro

    I don't have it, but I would assume that you have run out of VRAM and done fallback to CPU, which takes a lot longer. You can check your log to see (Halp > Troubleshooting > View Log File).

    There are many textures in the set, but you might also check if your character has a high subD, and/or strand based hair can be a killer.

  • PerttiAPerttiA Posts: 10,012
    edited September 2023

    The textures are taking 5GB's of RAM and when rendering Iray with the default compression settings, they take about 2.5GB's of VRAM and the geometry takes some too.
    Edit: Loaded up the scene, selected one of the ready made cameras and rendered; Geometry takes 350MB's of VRAM and Textures 3.3GB's of VRAM (Rendered at 1920x1200)

    Your GPU has 11GB's of VRAM, about 4GB's is taken by Windows, DS, the scene and the necessary working space, so you should still have about 4GB's left. So you have about 3.5GB's left
    Strand hairs and high SubD's can eat through VRAM like candy

    Post edited by PerttiA on
  • mark_z2487mark_z2487 Posts: 112

    thanks for the input

    I have started looking at the log file, not quite sure how to decipher it yet, not real sure where a particular rendering starts, I am starting one on the hour so it should be obvious

    Just the 2 figures, one with strand hair, by themselves render very fast, a few minutes,

    I have found in the past that a render that tock a day (should have stopped it sooner) tock only an hour or so if I rebooted the computer and did nothing else before starting the render, so I have tried that

    Looking at the log file, part of it below, I do see where it had a problem,

    Then, interestingly, later has the line:

    Available GPU memory has increased since out-of-memory failure. Re-enabling CUDA device

     

     

     

    2023-09-01 15:45:05.965 [WARNING] :: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(369): Iray [ERROR] - IRAY:RENDER ::   1.7   IRAY   rend error: CUDA device 0 (NVIDIA GeForce RTX 2080 Ti): Not enough memory for kernel launches (18.966 MiB (398.278 MiB) required, 0.000 B available). Cannot allocate framebuffer.

    2023-09-01 15:45:05.966 [WARNING] :: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(369): Iray [ERROR] - IRAY:RENDER ::   1.7   IRAY   rend error: CUDA device 0 (NVIDIA GeForce RTX 2080 Ti): Failed to setup device frame buffer

    2023-09-01 15:45:05.966 [WARNING] :: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(369): Iray [ERROR] - IRAY:RENDER ::   1.7   IRAY   rend error: CUDA device 0 (NVIDIA GeForce RTX 2080 Ti): Device failed while rendering

    2023-09-01 15:45:05.966 [WARNING] :: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(369): Iray [WARNING] - IRAY:RENDER ::   1.7   IRAY   rend warn : CUDA device 0 (NVIDIA GeForce RTX 2080 Ti) ran out of memory and is temporarily unavailable for rendering.

    2023-09-01 15:45:06.255 [WARNING] :: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(369): Iray [WARNING] - IRAY:RENDER ::   1.7   IRAY   rend warn : All available GPUs failed.

    2023-09-01 15:45:06.255 [WARNING] :: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(369): Iray [WARNING] - IRAY:RENDER ::   1.7   IRAY   rend warn : No devices activated. Enabling CPU fallback.

    2023-09-01 15:45:06.255 [WARNING] :: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(369): Iray [ERROR] - IRAY:RENDER ::   1.7   IRAY   rend error: All workers failed: aborting render

    2023-09-01 15:45:06.256 [WARNING] :: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(369): Iray [ERROR] - IRAY:RENDER ::   1.7   IRAY   rend error: CUDA device 0 (NVIDIA GeForce RTX 2080 Ti): [Guidance sync] Failed slave device (remaining 0, done 0).

    2023-09-01 15:45:06.262 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CPU: using 8 cores for rendering

     

    **********************

    2023-09-01 15:46:16.714 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Available GPU memory has increased since out-of-memory failure. Re-enabling CUDA device 0 (NVIDIA GeForce RTX 2080 Ti)

    2023-09-01 15:47:20.052 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Rendering with 1 device(s):

    2023-09-01 15:47:20.052 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info :         CUDA device 0 (NVIDIA GeForce RTX 2080 Ti)

     

  • PerttiAPerttiA Posts: 10,012

    If the figures are G9, it's probably too much.

    I use G8 and one character with clothing and hair takes from 800MB's to 2GB's of VRAM, G9 takes more.
    Use the eye-icon to hide items that are not visible to the camera. That will reduce the VRAM load.

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