A Practical Guide to GPU-Initiated Communication for Molecular Dynamics at Scale | NVIDIA Technical Blog

This post details a practical implementation of GPU-initiated communication for molecular dynamics simulations using NVIDIA NVSHMEM to replace CPU-orchestrated MPI halo exchange in GROMACS. It describes how dependency-aware kernel fusion and interconnect-aware transport logic were used to reduce kernel launches per timestep from six to one, enabling direct device-side data transfers and maximizing communication-computation overlap. Benchmarks on NVIDIA Eos and GB200 NVL72 clusters showed up to 2x performance improvement in intra- and inter-node strong scaling.