psblas3/test/comm/spmv

spmv overlap communication test

This test was added after introducing different communication schemes in PSBLAS.

It exercises the overlapped SpMV communication path inside psb_spmm.

Communication pattern:

• split exchange/computation flow (start + local compute + wait)
• halo/overlap update through internal swap routines used by SpMV kernels
• same matrix/vector workload repeated across schemes for timing comparison

Communication schemes compared:

• psb_comm_isend_irecv_
• psb_comm_ineighbor_alltoallv_
• psb_comm_persistent_ineighbor_alltoallv_

Unlike swapdata/, which checks direct halo exchange, this test covers the overlapped SpMV workflow.

Run options

• Default PDE-generated matrix: ./runs/psb_spmv_kernel [--gpu=TRUE|FALSE] [--nooverlap]
• External matrix: ./runs/psb_spmv_kernel [--gpu=TRUE|FALSE] --matrix=<path> [--fmt=MM|HB] [--nooverlap]

The overlap path is enabled by default; pass --nooverlap to force the non-overlapped halo-update path.

When --matrix is provided, the benchmark reads and distributes that matrix instead of generating the 3D PDE test matrix.