[petsc-users] Did CUDA break again?

[Mark Adams]

On Wed, May 26, 2021 at 7:13 PM Barry Smith <bsmith at petsc.dev> wrote:

>
>   What is HOST=cori09  Does it have GPUs?
>

That is the login node that I got the interactive compute node from. This
is my node:

 SLURM_JOB_NODELIST=cgpu02


>
>
> https://docs.nvidia.com/cuda/cuda-runtime-api/structcudaDeviceProp.html#structcudaDeviceProp_164490976c8e07e028a8f1ce1f5cd42d6
>
>   Seems to clearly state
>
> int  cudaDeviceProp
> <https://docs.nvidia.com/cuda/cuda-runtime-api/structcudaDeviceProp.html#structcudaDeviceProp>
> ::major
> <https://docs.nvidia.com/cuda/cuda-runtime-api/structcudaDeviceProp.html#structcudaDeviceProp_164490976c8e07e028a8f1ce1f5cd42d6>
>  [inherited]
>
> Major compute capability
>
>
> Mark, please compile and run this program on the machine you are running
> configure on
>
> #include <stdio.h>
> #include <cuda.h>
> #include <cuda_runtime.h>
> #include <cuda_runtime_api.h>
> #include <cuda_device_runtime_api.h>
> int main(int arg,char **args)
> {
> struct cudaDeviceProp dp;
>                 cudaGetDeviceProperties(&dp, 0);
>                 printf("%d\n",10*dp.major+dp.minor);
>
>                 int major,minor;
> cuDeviceGetAttribute(&major, CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MAJOR,
> 0);
> cuDeviceGetAttribute(&minor, CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MINOR,
> 0);
>                 printf("%d\n",10*major+minor);
>                 return(0);
> }
>
> This is what I get
>
> $ nvcc mytest.c -lcuda
> ~/petsc* (main=)* arch-main
> $ ./a.out
> 70
> 70
>
> This compiled and ran fine, but the output is wrong:

18:04 cgpu02  ~/petsc_install$ ./a.out
1120
-1431545180

It looks to me like there was a regression. I am running git bisect now. 7
more steps.
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