El Dorado: CMake warning: unable to determine MPI vendor on El Dorado

[cwpearson]

El Dorado is an El Capitan-like system (MI300A).

salloc -N 1 -t 4:00:00

git clone --depth 1 git@github.com:kokkos/kokkos.git

module load rocmcc rocm
module load cray-mpich
module load cmake/3.29.2

export CRAYPE_LINK_TYPE=dynamic
cmake -S kokkos -B /tmp/build-kokkos \
  -DCMAKE_CXX_STANDARD=20 \
  -DKokkos_ENABLE_HIP=ON \
  -DCMAKE_CXX_COMPILER=hipcc \
  -DCMAKE_INSTALL_PREFIX=.deps/kokkos \
  -DKokkos_ARCH_AMD_GFX942_APU=ON \
  -DCMAKE_BUILD_TYPE=Release
  
cmake --build /tmp/build-kokkos --target install --parallel 16

cmake -S . -B /tmp/build-kokkos-comm \
  -DCMAKE_CXX_STANDARD=20 \
  -DCMAKE_BUILD_TYPE=Release \
  -DKokkos_ROOT=.deps/kokkos \
  -DCMAKE_C_COMPILER=mpicc \
  -DCMAKE_CXX_COMPILER=mpic++ \
  -DCMAKE_EXE_LINKER_FLAGS="-lmpi_gtl_hsa -lxpmem" \
  -DKokkosComm_ENABLE_TESTS=ON

-- Kokkos Comm version: 0.2.0
-- Enabled Kokkos devices: SERIAL;HIP
CMake Warning at cmake/mpi-vendor.cmake:35 (message):
  Unable to determine MPI vendor - unknown MPI implementation
Call Stack (most recent call first):
  CMakeLists.txt:37 (kokkoscomm_set_mpi_vendor_variables)

$ which mpic++
/usr/tce/packages/cray-mpich/cray-mpich-9.0.1-rocmcc-6.4.0-cce-19.0.0d-magic/bin/mpic++

No mpirun or mpiexec, happens via srun or flux run.

[dssgabriel]

I am not familiar with Cray MPICH. What would be the equivalent baseline MPICH version of Cray MPICH 9.0.1? 4.x something?

In any case, does Cray MPICH ship a mpichversion executable? This is what we use in cmake/mpi-vendor.cmake to detect whether the provided MPI impl is MPICH.

[cwpearson]

Yeah, I'll have to poke around in the environment a bit and see what we can do.