mpi_halo.hpp File Reference

dem — portable (Kokkos) owner<->ghost particle halo for the distributed XPBD step. More...

Go to the source code of this file.

Detailed Description

dem — portable (Kokkos) owner<->ghost particle halo for the distributed XPBD step.

Kokkos counterpart of src/mpi/mpi_halo.h (MpiParticleHalo): a thin wrapper over transport-core's peclet::core::halo::ParticleHaloTopology<3> (host topology, periodic image shift) + ParticleHalo<3> (on-device gather/scatter + host-staged MPI). Rebuilt each substep from the owned positions; it gathers ghost copies of the owners' FULL state into the Particles SoA ghost slots and refreshes them owner->ghost during the velocity/position solves – the EXACT distributed scheme (ghosts carry REAL mass; every owned particle sees all its neighbours so it computes its full serial XPBD delta locally; ghost deltas are discarded via a self-mapped realIndices).

Faithful Kokkos port of Simulation::mpi_gather_ghosts / mpi_forward_positions / mpi_forward4. Gated behind PECLET_DEM_MPI (mirrors cfd's CFD_MPI): the default dem module never includes this, so it stays byte-identical when the macro is off.

Definition in file mpi_halo.hpp.