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Karma XPU barely using GPU Aug. 3, 2022, 5:53 a.m.

well
fgillis
But are you using Hardware Acceleration /Hardware Ray Tracing in Redshift? I believe that is what they call using Optix for ray tracing. This would also explain why the Denoiser doesn't work as it's also using Optix.

Redshift does render images making "full" use of the GPU's. But as you note, not only is the denoiser disabled, but I'm also getting an "OptiX msg: Error initializing RTX library" in the Redshift logs.

So, no hardware ray tracing, meaning something's obviously not right with my nvidia 515.48.07 driver installation.

Have also been unable to get the OptiX SDK sample files to run.

But, everything else seems to function correctly, and Redshift is solid, rendering without crashes.

Whereas, (Houdini 19.5) Karma XPU doesn't render at all.

Out of curiosity, anyone out there running a Debian 11 (or other Linux) system with Karma XPU running correctly? Redhift? OptiX SDK sample files?


well for me i test large scene in XPU

and in windows GPU working perfectly
BUT in debian 11 the GPU works BUT its failed all the time

the big question if karma XPU its out-of memory soo how is it possible thats in windows its working and in linux its doesn't?
and i take this even further in windows i also open two 3d software both with large scene and still its working perfectly without failing (also test it in 327 build and its do the same).
but in linux its failed all the time

when i check the render stats its show me that the total its 11GB (and i have 24GB) and still its failed in debian or ubuntu....
BUT in windows when i open 2 software with large scene i was amazed because its supposed to fail but its working perfectlly .
in the past i assumed that windows using "share GPU memory" but someone explain me thats its only for iGPU (and the wierd part thats windows still using it)

and also linux its far more effecint with vRAM soo it doesn't supposed to fail.
soo something wierd going on in linux behaveir with houdini .

XPU and memory usage, out of core July 28, 2022, 2:34 a.m.

habernir
malexander
It doesn't do this automatically (as GL can be called upon to do other rendering), but you can clear GL by displaying an empty LOP (like a SOP Create without anything in it), then switching the renderer to Karma XPU, and then displaying the LOP you want to render.
thanks for this advice
i already try it and the problem with this its that its doesn't release all the used vram soo in addition to that i clear it by use the cache manager and thats solve it.

it will be nice if sidefx team will add this very small feature to the render setting node by simple checkbox that will automatically release the vram when switching render .

and thanks alot.
Just want to mention that it was in Ubuntu BUT when I try it in windows without this trick or without clean cache it's working perfectly.

Very strange behavior.
I hope someone can verify this issue.

XPU and memory usage, out of core July 27, 2022, 11:56 a.m.

malexander
It doesn't do this automatically (as GL can be called upon to do other rendering), but you can clear GL by displaying an empty LOP (like a SOP Create without anything in it), then switching the renderer to Karma XPU, and then displaying the LOP you want to render.
thanks for this advice
i already try it and the problem with this its that its doesn't release all the used vram soo in addition to that i clear it by use the cache manager and thats solve it.

it will be nice if sidefx team will add this very small feature to the render setting node by simple checkbox that will automatically release the vram when switching render .

and thanks alot.