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ROCm-aware (AMDGPU) MPI multi-GPU test
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| using MPI | |
| using AMDGPU | |
| MPI.Init() | |
| comm = MPI.COMM_WORLD | |
| rank = MPI.Comm_rank(comm) | |
| # select device | |
| # using node-local communicator to retrieve node-local rank | |
| comm_l = MPI.Comm_split_type(comm, MPI.COMM_TYPE_SHARED, rank) | |
| rank_l = MPI.Comm_rank(comm_l) | |
| device = AMDGPU.device_id!(rank_l+1) | |
| # using default device if the scheduler exposes different GPU per rank (e.g. SLURM `--gpus-per-task=1`) | |
| # device = AMDGPU.device_id!(1) | |
| gpu_id = AMDGPU.device_id(AMDGPU.device()) | |
| # select device | |
| size = MPI.Comm_size(comm) | |
| dst = mod(rank+1, size) | |
| src = mod(rank-1, size) | |
| println("rank=$rank rank_loc=$rank_l (gpu_id=$gpu_id - $device), size=$size, dst=$dst, src=$src") | |
| N = 4 | |
| send_mesg = ROCArray{Float64}(undef, N) | |
| recv_mesg = ROCArray{Float64}(undef, N) | |
| fill!(send_mesg, Float64(rank)) | |
| AMDGPU.synchronize() | |
| rank==0 && println("start sending...") | |
| MPI.Sendrecv!(send_mesg, dst, 0, recv_mesg, src, 0, comm) | |
| println("recv_mesg on proc $rank: $recv_mesg") | |
| rank==0 && println("done.") |
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