I think it said that data access is via Lustre, and communication is by Nvidia MLNX NCCL, which seems to be some kind of nvidia gpu-specific MPI type library; i

I think it said that data access is via Lustre, and communication is by Nvidia MLNX NCCL, which seems to be some kind of nvidia gpu-specific MPI type library; it would seem to be doing RDMA from GPU to GPU via fabric interconnects, so far as I can tell...