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Hello! On every scene when I render at about 30-60 min my render stopped and I have info in log:
CUDA error 715 on device 2: Error code unknown.
-> kernel execution failed (pmc)
device 2: PMC failed
<<< Render Failure >>>
CUDA error 715 on device 2: Error code unknown.
-> failed to deallocate device memory

What this means? How can I solve this? I use latest version of Octane Render for C4D.

Regards,
Lukas

Sounds like the GPU overheated. Use GPU-Z to track your GPU temperatures.

Paul

I use watercooling system. Max temp hit by GPU is 55°C

Have you checked free VRAM and total triangle counts in LV and PV's info lines?

I will check, but where is and what is LV and PV's info lines?

As in image. Also Picture Viewer display a line at bottom for similar info. You can check manual or tutorials for extra information about LV.
Also please update your version to 2.41.1 R3(Stable) or 2.42.2 TEST version.

From picture viewer:

From Live Viewer Window:


I use 2xGTX780Ti and one GTX690 (so in octane gpu0: 780ti, gpu1: 780ti, gpu2: 690, gup3: 690).

Is it single frame render with 34K maxsamples on PMC? I think you have displaced geometry? Displacement and pmc can cause a crash on cuda.
Hard to know without trying it. I can take a look and send to Octane devs If you could think to send me a standalone scene.

Yes I use displaced geometry. 34K maxsamples because I turn on time limit. I update to new stable version as you write 2.41.1 R3(Stable) and create scene without any displacement. And I still have error:
CUDA error 700 on device 2: Error code unknown.
-> kernel execution failed (pmc)
device 2: PMC failed
<<< Render Failure >>>
CUDA error 700 on device 2: Error code unknown.
-> failed to deallocate device memory
CUDA error 700 on device 2: Error code unknown.
-> could not get memory info


What more can I do?

When I use 2xGTX780Ti and one GTX690 (so in octane gpu0: 780ti, gpu1: 780ti, gpu2: 690, gup3: 690). Does that means gpu2: 690 is give me error?