Add `has_rocm` for OpenMPI

[avik-pal]

See https://docs.open-mpi.org/en/main/man-openmpi/man3/MPIX_Query_rocm_support.3.html#mpix-query-rocm-support

Seems to be available from v5 of OpenMPI

[giordano]

Can also document has_rocm in https://juliaparallel.org/MPI.jl/stable/knownissues/#Hints-to-ensure-ROCm-aware-MPI-to-be-functional, like has_cuda is documented in the CUDA section.

[giordano]

@avik-pal are you interested in moving this forward?

[avik-pal]

Completely fell off my radar, I will finish this over the weekend

[JBlaschke]

Once this is merged, I can implement has_gpu; has_cuda and has_rocm for Cray MPICH

[luraess]

Maybe one could add a sentence similar to CUDA (https://github.com/JuliaParallel/MPI.jl/blob/master/docs/src/usage.md)

If using OpenMPI, the status of CUDA support can be checked via the [MPI.has_cuda()](https://github.com/JuliaParallel/MPI.jl/blob/master/docs/src/@ref) function.

in the ROCm-aware section of the docs?

[avik-pal]

Maybe one could add a sentence similar to CUDA (master/docs/src/usage.md)

If using OpenMPI, the status of CUDA support can be checked via the [MPI.has_cuda()](https://github.com/JuliaParallel/MPI.jl/blob/master/docs/src/@ref) function.

in the ROCm-aware section of the docs?

done

[giordano]

Thanks!

[giordano]

Can also document has_rocm in https://juliaparallel.org/MPI.jl/stable/knownissues/#Hints-to-ensure-ROCm-aware-MPI-to-be-functional, like has_cuda is documented in the CUDA section.

Last documentation request and the we should be good to go ☝️

[avik-pal]

Updated the docs

[vchuravy]

Can you erase on master?

[avik-pal]

Can you erase on master?

What do you want me to erase?

[giordano]

I presume that was meant to be "rebase".