psblas3/test/comm/README.md

Communication scheme tests

This directory contains tests created after adding multiple communication schemes to PSBLAS.

The goal is to exercise and compare communication patterns at different layers:

• direct halo exchange (psi_swapdata)
• overlap exchange for transpose/SpMV workflows (psi_swaptran + psi_swapdata)
• full Krylov solver runs (CG) using different comm schemes.

Communication schemes covered in this area:

• psb_comm_isend_irecv_ (baseline point-to-point)
• psb_comm_ineighbor_alltoallv_ (neighbor collective)
• psb_comm_persistent_ineighbor_alltoallv_ (persistent neighbor collective)

See:

• swapdata/ for a direct halo-exchange test.
• spmv/ for an overlap SpMV test that uses different communication schemes.
• cg/ for a conjugate-gradient solve-time comparison across the three schemes.