What to look for if Render drops to CPU [SOLVED]
AbnerK
Posts: 718
Hi, I'm doing a render that is taking much longer than I'd expect for a simple scene. I can normally do other things including use Photoshop when render is going but, this one seems to hogging my whole computer.
What do I look for on my log. Here's my log. attached
Thanks
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log.txt
747K
Post edited by AbnerK on
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Looks like you ran out of vRAM on your graphics card. There's a problem with iray not realeasing vRAM it's done with in recent versions. Might try closing and restarting DAZ, that seems to help.
A few things to consider when rendering.
1. Track your vram usage, before, you try to render. It's very easy to use up several GB of vram just in setting up your scene, and/or with other programs running in the background. Task manager(Win 10), GPU-Z or SMi.
2. When you are rendering, don't open anything else. You may cause DS to drop to CPU due to the increased Vram usage. You also may cause a performance drop as the gpu switches between tasks. push the render button and go have a coffee.
3. If it does drop to CPU, Stop, Save your scene, Close ds, and if vram is still being used, restart the system. Then Restart DS, load the scene, and try rendering again.
Due to iray's memory release problem, you might be able to get the render started on first open, but not on subsequent attempts to render in the same session.
4. If you're cpu rendering, you might want to consider reducing the cores used to by 1. This will still allow, some other work, to be done, but will still impact render performance, especially if the other program is a cpu hog(photoshop).
But, that sounds like a guess, is there anthing in the log to say I did drop to CPU. I am no wiser before asking the question. I've rendered way bigger scenes and than this with 1 figure and a prop with a few simple planes. I've rendered city scenes faster. What part of the log tells you I ran out of vRAM I had Daz open, Edge and Photoshop, nothing I haven't done many, many times.
The log says you're rendering on CPU. Looks like it didn't even try to use your card.
2021-03-15 16:05:38.330 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Initializing local rendering.
2021-03-15 16:05:38.342 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CPU: using 16 cores for rendering
2021-03-15 16:05:38.343 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering with 1 device(s):
2021-03-15 16:05:38.343 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CPU
2021-03-15 16:05:38.343 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering...
You did run out of vram earlier in the day
2021-03-15 15:00:25.042 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(359): Iray [ERROR] - IRAY:RENDER :: 1.11 IRAY rend error: CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design): Not enough memory for kernel launches (0.000 B (321.300 MiB) required, 0.000 B available). Cannot allocate framebuffer.
2021-03-15 15:00:25.053 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend progr: Received update to 00133 iterations after 28.578s.
2021-03-15 15:00:25.054 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(359): Iray [ERROR] - IRAY:RENDER :: 1.12 IRAY rend error: CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design): Failed to setup device frame buffer
2021-03-15 15:00:25.054 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(359): Iray [ERROR] - IRAY:RENDER :: 1.12 IRAY rend error: CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design): Device failed while rendering
2021-03-15 15:00:25.063 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(359): Iray [WARNING] - IRAY:RENDER :: 1.12 IRAY rend warn : CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design) ran out of memory and is temporarily unavailable for rendering.
2021-03-15 15:00:26.836 WARNING: ..\..\..\..\..\src\pluginsource\DzIrayRender\dzneuraymgr.cpp(359): Iray [WARNING] - IRAY:RENDER :: 1.4 IRAY rend warn : Re-rendering iteration because of device failure
I'd restart DAZ and also check the enabled render devices on the Render tab
Thank you. I've never had this problem before. I was on a mac until November and it's always been fine before this. Thanks.
Thanks, I'm very new to PC's so it's not something I've had to deal with before. My card should more than enough ram to deal with anything I throw at it. I don't know why it would need vRAM. I could have been Marvelous Designer that had caused the problem. I used Marvelous Designer all the time and don't tend to uese the GPU rendering as I prefer the results fromt the CPU (I didn't really think of it in those terms before, it says GPU but it doesn't say CPU render, I don't think I didn't have the GPU option on my mac so the devault for me was the, now, middle option). As I say I prefer the wrinkly results from the middle option. The Complete and GPU tend to smooth it all out too much too fast.
Thanks
I'm restarting it all now. (on my mac now)
So, just so that I'm clear.
this is now using the GPU to render.
2021-03-16 10:01:21.774 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating geometry.
2021-03-16 10:01:21.775 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating motion transforms.
2021-03-16 10:01:21.780 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Importing scene graph.
2021-03-16 10:01:22.466 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Auto instancing compression ratio 1.05 (Full instancing compression ratio 1.05)
2021-03-16 10:01:22.466 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Importing geometry for motion time 0
2021-03-16 10:01:23.156 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Geometry import (2 triangle objects with 7797k triangles, 0 fiber objects with 0 fibers (0 segments), 2 triangle instances yielding 7797k triangles, 0 fiber instances yielding 0 segments) took 0.690s
2021-03-16 10:01:23.160 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating materials.
2021-03-16 10:01:23.361 Iray [INFO] - MATCNV:RENDER :: 1.0 MATCNV rend info : found 269 textures, 0 lambdas (0 unique)
2021-03-16 10:01:23.365 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Emitter geometry import (6 light sources with 56 triangles, 1 instance) took 0.000s
2021-03-16 10:01:23.366 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating environment.
2021-03-16 10:01:34.289 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating backplate.
2021-03-16 10:01:36.465 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating lens.
2021-03-16 10:01:36.465 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating lights.
2021-03-16 10:01:36.466 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating object flags.
2021-03-16 10:01:36.467 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating caustic portals.
2021-03-16 10:01:36.467 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Updating decals.
2021-03-16 10:01:36.476 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Using iray core convergence estimate.
2021-03-16 10:01:36.481 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Allocating 1-layer frame buffer
2021-03-16 10:01:36.483 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Using interactive scheduling, caustic sampler disabled
2021-03-16 10:01:36.484 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Initializing local rendering.
2021-03-16 10:01:36.486 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CPU: using 15 cores for rendering
2021-03-16 10:01:36.487 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Using OptiX version 7.1.0
2021-03-16 10:01:36.899 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Initializing OptiX for CUDA device 0
2021-03-16 10:01:37.252 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering with 2 device(s):
2021-03-16 10:01:37.252 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design)
2021-03-16 10:01:37.252 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CPU
2021-03-16 10:01:37.252 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering...
2021-03-16 10:01:37.256 Iray [INFO] - IRAY:RENDER :: 1.14 IRAY rend progr: CPU: Processing scene...
2021-03-16 10:01:37.256 Iray [INFO] - IRAY:RENDER :: 1.10 IRAY rend progr: CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design): Processing scene...
2021-03-16 10:01:37.258 Iray [INFO] - IRAY:RENDER :: 1.2 IRAY rend info : Using Embree 3.10.0
2021-03-16 10:01:37.258 Iray [INFO] - IRAY:RENDER :: 1.2 IRAY rend info : Initializing Embree
2021-03-16 10:01:37.345 Iray [VERBOSE] - IRAY:RENDER :: 1.7 IRAY rend stat : Geometry memory consumption: 250.411 MiB (device 0), 0.000 B (host)
2021-03-16 10:01:53.349 Iray [INFO] - IRAY:RENDER :: 1.2 IRAY rend info : Importing lights for motion time 0
2021-03-16 10:01:53.350 Iray [INFO] - IRAY:RENDER :: 1.2 IRAY rend info : Initializing light hierarchy.
2021-03-16 10:01:53.354 Iray [INFO] - IRAY:RENDER :: 1.2 IRAY rend info : Light hierarchy initialization took 0.003s
2021-03-16 10:01:53.358 Iray [VERBOSE] - IRAY:RENDER :: 1.2 IRAY rend stat : Native CPU code generated in 0.000s
2021-03-16 10:01:53.552 Iray [VERBOSE] - IRAY:RENDER :: 1.7 IRAY rend stat : Texture memory consumption: 778.474 MiB for 58 bitmaps (device 0)
2021-03-16 10:01:53.559 Iray [VERBOSE] - IRAY:RENDER :: 1.7 IRAY rend stat : Lights memory consumption: 12.473 KiB (device 0)
2021-03-16 10:01:53.559 Iray [VERBOSE] - IRAY:RENDER :: 1.7 IRAY rend stat : Material measurement memory consumption: 0.000 B (GPU)
2021-03-16 10:01:53.559 Iray [VERBOSE] - IRAY:RENDER :: 1.7 IRAY rend stat : Materials memory consumption: 251.074 KiB (GPU)
2021-03-16 10:01:54.606 Iray [INFO] - IRAY:RENDER :: 1.14 IRAY rend info : CPU: Scene processed in 17.350s
2021-03-16 10:01:54.611 Iray [INFO] - IRAY:RENDER :: 1.2 IRAY rend info : CPU: Allocated 800.766 KiB for frame buffer
2021-03-16 10:01:54.870 Iray [INFO] - IRAY:RENDER :: 1.10 IRAY rend info : CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design): Scene processed in 17.613s
2021-03-16 10:01:54.873 Iray [INFO] - IRAY:RENDER :: 1.2 IRAY rend info : CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design): Allocated 7.411 MiB for frame buffer
2021-03-16 10:01:54.932 Iray [INFO] - IRAY:RENDER :: 1.10 IRAY rend info : CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design): Allocated 1.750 GiB of work space (2048k active samples in 0.058s)
2021-03-16 10:01:55.066 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend progr: Received update to 00001 iterations after 17.800s.
2021-03-16 10:01:55.072 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering...
2021-03-16 10:01:55.072 Iray [VERBOSE] - IRAY:RENDER :: 1.7 IRAY rend stat : Native CPU code generated in 0.000s
2021-03-16 10:01:55.395 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend progr: Received update to 00003 iterations after 18.123s.
I would say so but, I'm just wanting to be sure since this render still took longer than I'd expect for a simple scene.
Thanks
The log says you're using both the CPU and GPU:
2021-03-16 10:01:37.252 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering with 2 device(s):
2021-03-16 10:01:37.252 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design)
2021-03-16 10:01:37.252 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CPU
Have you checked the Nvidia site to see if you are using the up to date driver?
I updated it a couple of weeks ago.
it was the CUDA device 0 that was confusing. I have used both settings wtih the CPU and GPU on and with only GPU on and it renders in exactly the same amount of time.
I'm the kind of person that does not like ambiguity and when it says it's using 16 cores and then rendering with 2 devices, I'm immediately questioning what the **** that means. Language is full of ambiguity and people use language soooooooooo badly.
2021-03-16 10:01:36.484 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Initializing local rendering
.2021-03-16 10:01:36.486 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CPU: using 15 cores for rendering
2021-03-16 10:01:36.487 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Using OptiX version 7.1.0
2021-03-16 10:01:36.899 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Initializing OptiX for CUDA device 0
2021-03-16 10:01:37.252 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : Rendering with 2 device(s):
2021-03-16 10:01:37.252 Iray [INFO] - IRAY:RENDER :: 1.0 IRAY rend info : CUDA device 0 (GeForce RTX 2080 Super with Max-Q Design)
Clearly states the 15 cores are the CPU and Optix is the CUDA device 0. What's ambiguous about it?
"device"
I don't think you could get anymore ambiguous. IBut, I don't have to justify my confusion to you.
@AbnerK
CUDA cores are on the Nvidia GPUs. Two lines beelow the "Initializing OPTIX . . . ", the log says CUDA Device 0 (GeForce 2080 Super . . . )
Was that not clear enough?
Let's keep the discussion civil, please.
you can chose to reduce how many threads you use when it drops to CPU making your system still workable when rendering.
on the 'render settings' tab select 'Advanced' from the top tabs. near the bottom is 'Scheduling' select CPU thread affinity box and in the CPU load limit select the number of threads below max you want to allow to be used for rendering. Don't limit it too much keeping 20-25% for other tasks will allow you to keep working while a CPU bound render runs.
also: your GPU is MUCH faster at rendering than your CPU. I think most people (including me) configure the advanced render tab settings, so that only the GPU renders; adding the CPU isn't worth it.
My CPU is only the fallback, in case the GPU fails because the scene does not fit into the GPU's VRam (and that will be sloooow).
Photoshop (and other graphics software) can also use the GPU, and might compete for VRam if they run at the same time.
The forum is here for people who are unclear on something. That I am lacking in knowledge as to what certain words and phrases refer to is not something I have to justify or explain. I don't have to defend myself. Asking for explanation is what the forum is for. I fail to understand why I am being asked to explain myself twice. The remark I am replying to neither answers any question I asked nor helps me understand. I don't understand why it is relevant, it is certainly not asked for by me and it helps nobody understand the Log. I do not understand the need for it at all. Perhaps you could explain the need for an answer.