[QUESTION] Architecture mismatch error

[tbhaxor]

Which Kokkos_ARCH_ should I use for the NVIDIA Tesla V100 cards.

I am using it with athenapk and it is failing with error

==> Error: Spec 'cuda@11.4.0' matches no installed packages.
Kokkos::Cuda::initialize ERROR: likely mismatch of architecture

Currently I am using -DKokkos_ARCH_VOLTA72=ON, this caused error

[tbhaxor]

In the wikipedia it also mention VOLTA https://en.wikipedia.org/wiki/List_of_Nvidia_graphics_processing_units

[masterleinad]

Kokkos_ARCH_VOLTA70=ON.

[masterleinad]

In general, the last two digits match the compute capability of the architecture to use.

[tbhaxor]

Kokkos_ARCH_VOLTA70=ON.

And, how did you find it?

Where is this documented?

[stanmoore1]

See table here: https://en.wikipedia.org/wiki/CUDA

[stanmoore1]

Also see this link: https://github.com/kokkos/kokkos/wiki/Compiling EDIT: that link is deprecated. You can see the current list here:

https://github.com/kokkos/kokkos/blob/develop/cmake/kokkos_arch.cmake#L84

[tbhaxor]

See table here: https://en.wikipedia.org/wiki/CUDA

Ohk, since there are only two arch versions, its easy to test. Can we have a GPU product to Kokkos arch mapping? That would be a great help as mentioned in kokkos/kokkos-core-wiki#370

[masterleinad]

Also, note that the architecture is auto-detected when using CMake and configuring on a compute node.

[tbhaxor]

Yes, it does but not on HPC login nodes where we have only CPU and use slurm scripts to schedule jobs for GPU nodes.

[masterleinad]

Right, but you could also execute https://github.com/kokkos/kokkos/blob/develop/cmake/compile_tests/cuda_compute_capability.cc on a compute node (if configuring Kokkos in a job script is too difficult).

[tbhaxor]

Great @masterleinad this would solve issue.