Compilation error when calling PathSolver

[ziminghe]

Hi,

I am using sionna-rt to run the following tutorial example and have an issue, could you please give me some suggestions on how to solve it?
https://nvlabs.github.io/sionna/rt/tutorials/Scattering.html

I am fine to run steps [1] - [4], but get an error when calling function p_solver() in step [5]:

p_solver = PathSolver()
paths = p_solver(scene=scene, los=False, specular_reflection=True)

The error message from running the code in jupyter notebook:

Dr.Jit encountered an unrecoverable error and will now shut
down. Please re-run your program in debug mode to check for
out-of-bounds reads, writes, and other sources of undefined
behavior. You can do so by calling

dr.set_flag(dr.JitFlag.Debug, True)

at the beginning of the program. If these additional checks
fail to pinpoint the problem, then you have likely found a
bug. We are happy to help investigate and fix the problem if
you can you create a self-contained reproducer and submit it
at https://github.com/mitsuba-renderer/drjit.

The error message of this specific failure is as follows:
jit_optix_compile(): optixModuleGetCompilationState() indicates that the compilation did not complete succesfully. The module's compilation state is: 0x2363
Please see the PTX assembly listing and error message below:

.version 6.5
.target sm_50
.address_size 64

.const .align 8 .b8 params[216];
.....

The code example runs on sionna version 1.0.2, Dr.Jit version 1.0.3, Windows 10, the driver version is 556.12, CUDA version is 12.5:

[ziminghe]

I have update the driver and CUDA version to the latest, still have the same issue:

[merlinND]

Hello @ziminghe,

It was a good idea trying to update the driver.

Could you please try creating a fresh Python virtual environment, installing Mitsuba pip install mitsuba and running the Mitsuba quick start: https://mitsuba.readthedocs.io/en/stable/src/quickstart/mitsuba_quickstart.html
In that tutorial, replace mi.set_variant("scalar_rgb") with mi.set_variant("cuda_ad_rgb") so that the GPU is used.

[ziminghe]

[merlinND]

Hello @ziminghe,

I meant running the Mitsuba quick start tutorial: https://mitsuba.readthedocs.io/en/stable/src/quickstart/mitsuba_quickstart.html
That's where you should replace mi.set_variant("scalar_rgb") with mi.set_variant("cuda_ad_rgb").

The idea is to run Mitsuba alone, without Sionna, in order to find out whether the problem is related to Sionna or not.

[ziminghe]

Hi @merlinND

Thanks for your clarification, and I have run the code according to your suggestion.

The quick start tutorial replaced with mi.set_variant("cuda_ad_rgb") runs without any error, so I believe the problem is related to sionna rt?

[merlinND]

Hello @ziminghe,

Good to see that the Mitsuba tutorial is running.
Could you please post the full error output?

You could also try updating the driver again to the latest version just in case.

[ziminghe]

I've updated sionna-rt to version 1.1.0, still have the same issue.

[ziminghe]

I used a more advanced GPU and problem solved. I guess the above issue is due to the GPU is too old (Nvidia Quadro P400).

[merlinND]

Thank you for the update @ziminghe, that's good to know.
In theory it should still be supported, but there may be a subtle incompatibility with that older GPU.