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Technical Discussion » XPU: free up VRAM without restarting Houdini?

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brians
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ajz3d
Is it possible to free up VRAM occupied by Karma XPU from past viewport renders without restarting Houdini?

XPU should be freeing its data no worries (either when the renderer is closed down, or if it fails). It could be another system is holding onto the VRam (eg OpenCL or Vulakn). We are aware of a GPU memory leak with regards to OpenCL to Vulkan interop. We are wanting to improve this area, so will keep you posted.
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Technical Discussion » Normal Map Issue with Secondary UV Map in Karma XPU

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brians
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can you submit this as a bug?
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Solaris and Karma » Karma XPU : noise jittering

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brians
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Are you in a position to post the source EXR files? (1 clean, 1 broken)
Perhaps there is information in the header that could give us clues
thanks
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Solaris and Karma » Karma XPU : noise jittering

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brians
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Two things jump to mind
- what happens if you render with the variance oracle disabled?
- are you able to replicate the issue with a simplified scene? (and therefore can submit a bug)
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Solaris and Karma » Karma XPU Nvidia 5000 series support?

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brians
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Apparently the term "5000 series" is a little loaded :/
It means either...
- RTX 5000 Ada
or
- Blackwell range (5090 etc...)

Either way, Karma XPU does not have the same issue as RedShift. It should work on Blackwell fine without any updates, etc.
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Solaris and Karma » Karma XPU Nvidia 5000 series support?

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brians
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Nvidia 5000 series means an ADA card I think.
The main feature that came with ADA was the "shader execution reordering" (ie SER) which KarmaXPU has support for in 20.5
SER gave a 1.5-2x speedup
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Solaris and Karma » CUDA_ERROR_INVALID_VALUE

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brians
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Thanks Mirko
I saw Julca's (+ your) reply on the other thread.
I know Julca is busy, but were you able to reproduce this CUDA_ERROR_INVALID_VALUE on a stripped-down scene? Or does it only happen on the full scene?
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Solaris and Karma » Karma XPU : lights blinking and more

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brians
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julca
For now I havn't succes to reproduce it in a simple scene.
I have also have a deadline and we do our best to deliver project in time.

Ok, thanks for what you've sent already.
We'll have a look and get back to you in the coming days.
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Solaris and Karma » CUDA_ERROR_INVALID_VALUE

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brians
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Mirko Jankovic
And onemroe udpate. After pruning some objects that are not directly visible in one of the shots my mahcine is wokring properly again and full pwoer draw is visible on GPUs when rendering. And no crashing.

Whats the memory like on your GPUs (and on your CPU) like when you have issues?
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Solaris and Karma » CUDA_ERROR_INVALID_VALUE

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brians
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Mirko Jankovic
2025-03-16 16:09:40: 0: STDOUT: KarmaXPU: device Type:Optix ID:0 has registered a critical error , so will now stop functioning. Future error messages will be suppressed

Sorry but the forum strips the most important part of that message out, the actual error :/
can you type it manually? or perhaps post a screenshot?

(ps: I'll rework our error-messages so they have a format that won't get stripped by the forum)

thanks
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Solaris and Karma » Karma XPU : lights blinking and more

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brians
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>
julca
I have multiple lights blinking in my animation.
Some instanced, other manually placed.
And for some reason one same blinking from time to time randomly on same render pass..
On each interior rendering pass there is one (but not the same) that is blinking.

I see a bug regarding the "large (ie 5K) render being slower than tiled" issue has been submitted thanks.

But have you submitted a bug regarding the flickering lights?
It'll be near impossible for us to debug this without a repro scene. Is it possible you could submit a bug with a repro scene that exhibits the flickering issue? (eg just the lights with some proxy geo)

Mirko Jankovic
One of my machines is regularily failing during rendering (ryzen 5950x, 128GB ram, 2xx4090).
During rendering GPU just fails and stop being used then other one as well

What error messages do you get regarding the GPU failings? Can you post a render log?
Edited by brians - 2025年3月18日 18:06:51
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Solaris and Karma » Karma XPU Procedural Ocean rendering artifact

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brians
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Its our "uniform volumes spans ray" can only capture a fixed number of hits/spans
https://www.youtube.com/watch?v=yY1m8NeryaI&t=767 [www.youtube.com]

This number is fixed due to the GPU's stack memory limitations. If we increase the number, the GPU will run slower. So, it's a balancing act about having enough, but not too much.
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Solaris and Karma » Karma XPU Procedural Ocean rendering artifact

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brians
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Try setting the KARMA_XPU_MAX_UNIFORM_VOLUME_SPANS envvar to a higher value. It defaults to 32, try 128 (or something)
Going too high will hurt performance, so be a little careful with it
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Solaris and Karma » Karma nested dielectrics issue

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brians
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Have you tried tweaking the ray bias?
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Technical Discussion » Karma: materialX Constant unshaded surface: how to

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brians
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Also check out MtlxUnlitSurface
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Solaris and Karma » Karma is very slow ?

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brians
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philippepetitpas
I always render with at least crypto, honestly the render time difference is huge.

What happens if you set the KARMA_XPU_NUM_PER_DEVICE_BLENDING_THREADS envvar to 2,3 or 4? Do you get a speedup with crypto in that case?
https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html#aovs [www.sidefx.com]
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Solaris and Karma » XPU has some sort of color problem

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brians
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Flowww_Studio
I have already sent in an rfe, as i think it must be a bug

How have things progressed with this?
Did you get a support ID with this report?
I'm having trouble finding it in our system.
thanks
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Technical Discussion » Karma XPU vs CPU Issue

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brians
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cwrenniks
I'm not seeing this problem in the latest production build ( 20.5.410)

More details here
https://www.sidefx.com/forum/topic/98442/ [www.sidefx.com]
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Technical Discussion » [cudaErrorIllegalAddress] Karma XPU error

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brians
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BlackOceanTide
reverting to NVidia's 560.94 while still using 20.5.278 made it better but didn't solve it.

20.5.278 had an issue that was fixed in 20.5.370
https://www.sidefx.com/forum/topic/97577/?page=2#post-431105 [www.sidefx.com]

BlackOceanTide
What currently seems to solve it is the combination of 560.94 and 20.5.370 while 20.5.370 doesn't work with the most current NVidia driver.

The 565 drivers have been problematic
https://www.sidefx.com/forum/topic/98442/ [www.sidefx.com]

We've put a potential workaround into 20.5.397
So please try 20.5.397 with latest driver and let us know how you get on.
Testing so far has been positive, so I expect a production build to go out soon.

thanks
Edited by brians - 2024年11月4日 10:10:24
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Solaris and Karma » material X BSDF nodes and Karma XPU

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brians
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“Does not support MaterialX pbr nodes”
https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html#materials-shading [www.sidefx.com]
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