Ptxas fatal : Value 'sm_30' is not defined for option 'gpu-name'

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1

Hi, I am using a systems with Centos 8, with a GTX950, installed gcc-offload-nvptx.
I try to offload OpenMP code to GPU, using a very simple example with #omp target.
Unfortunately in compile I get the error messages:

ptxas fatal : Value ‘sm_30’ is not defined for option ‘gpu-name’
nvptx-as: ptxas returned 255 exit status
mkoffload: fatal error: x86_64-redhat-linux-accel-nvptx-none-gcc returned 1 exit status
compilation terminated.

How to deal with this ptxas fatal error?

Thnx

1 Like
2

I believe this is due to NVIDIA dropping support for SM_30 in latest CUDA and gcc-offload-nvptx to force use it. I’m still banging my head on this myself. Trying older CUDA if that works for you may be the easiest route out. See also Installation issue: gcc+nvptx · Issue #18444 · spack/spack · GitHub

3

Finally installed pgcc from NVidia, which works fine.

4

I have the same problem, I have to run opencv < 4 because the camera SDK I have uses IplImage, which has been eliminated from opencv 4, so I am trying to use opencv 3.3.1 but can’t compile with Cuda 11.2 and get the same error ‘sm_30’ … etc. (NB: under ubuntu 20.04).

So my question is : what is pgcc and where can I find it, since it seems to have solved the problem for you ?

Thanks

5

Please look here: PGI Compilers & Tools
I have been informed today by email, so the answer is a bit delayed

6

Hi, I think this could help as I’ve been struggling with this issue. I’m trying to offload some code to GPU with openmp.

I found that the option -foffload=-misa=sm_35 avoid buiding the SM_30 architecture which is not supported anymore on cuda 11.

My full command line looks like this :
g++ -fopenmp -foffload=nvptx-none -fcf-protection=none -foffload=-misa=sm_35 -fno-stack-protector -O3 myfile.cpp -o mybinary

Hoping this might help someone.