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CG no-preconditioner communication test

This test lives under test/comm/cg and builds a local executable:

source: psb_comm_cg_test.F90
executable: runs/psb_comm_cg_test

Behavior:

generates a 3D PDE matrix using local psb_d_gen_pde3d (double precision)
solves with CG
uses preconditioner NONE
runs CG three times, changing communication scheme of x each run

Communication pattern used in this test:

reset solution vector
set communication scheme on x%v%comm_handle
run full psb_krylov('CG', ...)
collect and compare solve time

Schemes compared:

psb_comm_isend_irecv_
psb_comm_ineighbor_alltoallv_
psb_comm_persistent_ineighbor_alltoallv_

How to run

From this directory:

make run (defaults: NP=4, IDIM=40)
make run NP=8 IDIM=80

Default PDE-generated matrix:

./runs/psb_comm_cg_test [idim] [nrep] [nwarm] [itmax] [--gpu=TRUE|FALSE]

External matrix input:

./runs/psb_comm_cg_test [idim] [nrep] [nwarm] [itmax] --matrix=<path> [--fmt=MM|HB] [--gpu=TRUE|FALSE]

When --matrix is provided, the test reads and distributes that matrix and ignores the PDE generator.