Is there some way to reinitialize/reset an optix device if it fails during xpu rendering so it contributes to rendering again or is the only way to restart houdini?

that would be neat. Not that I know of.

ronald_a
Is there some way to reinitialize/reset an optix device if it fails during xpu rendering so it contributes to rendering again or is the only way to restart houdini?

Try switching to KarmaCPU, then back to KarmaXPU

brians

ronald_a
Is there some way to reinitialize/reset an optix device if it fails during xpu rendering so it contributes to rendering again or is the only way to restart houdini?

Try switching to KarmaCPU, then back to KarmaXPU

I'm afraid that does not work. It would be really helpful if this could be added. Would make debugging problems with xpu a lot more comfortable and quicker.

brians
Try switching to KarmaCPU, then back to KarmaXPU

ronald_a
I'm afraid that does not work.

That is strange, as switching between CPU and XPU destroys and recreates the XPU renderer.

What is the error you're getting from the device?
You'll be able to see when you enable the on-screen stats, as shown in this "how to" section of the xpu docs
https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html#howto [www.sidefx.com]

in the renderstats it just says cuda error and then the renderstats for the gpus disappear. In the og Viewer it says: "KarmaXPU: device Type:Optix ID:0 has registered a critical error , so will now stop functioning. Future error messages will be suppressed"

I am on window10 and my driver version is 546.01 (with 2x RTX A4500).

I have a scene attached which creates the problem.

ronald_a
or is the only way to restart houdini?

Are you finding that restarting houdini actually fixes the issue?

ronald_a
in the renderstats it just says cuda error

Are you able to screenshot that for me? thanks

ronald_a
I am on window10 and my driver version is 546.01 (with 2x RTX A4500).

That driver is not within our recommended range.
https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html#supported-hardware [www.sidefx.com]
https://www.sidefx.com/Support/system-requirements/ [www.sidefx.com]

Are you able to test with 546.33 (it'll be listed as a GeForce driver, but should be fine for testing)


thanks lots

Ok, so I did install the recommended driver which did not change anything but then remembered, that I had some Karma Optix bug fixing variables set (KARMA_XPU_OPTIX_FORCE_GAS_TRACE, KARMA_XPU_OPTIX_VALIDATION_MODE, KARMA_XPU_OPTIX_DC_STACK_BOOST) which seemed to cause the problem. I removed them and now the scene renders as expected.

It is now also true, that if XPU devices fail, switching to CPU and back to XPU restarts XPU and the XPU devices work again without restarting Houdini.

Great!
Glad we got to the bottom of it.
Thanks Ronald