Add a block-structured distributed operator that presents itself to Krylov
solvers and preconditioners as a single ordinary distributed matrix (the
PSBLAS analogue of PETSc MATNEST), targeting saddle-point systems
M = [[A, B^T], [B, 0]] with possibly rectangular sub-blocks.
Library (base/modules):
- psb_desc_nest_mod, psb_d_nest_mat_mod: grid of per-field descriptors and
per-block sparse storage.
- psb_d_nest_base_mat_mod: psb_d_nest_base_mat, the operator extending
psb_d_base_sparse_mat (local csmv, free, field-split hooks for a future
block preconditioner).
- psb_cd_nest_tools_mod / psb_d_nest_tools_mod: composed global descriptor
with union halo (psb_cd_nest_compose) and rectangular local block builder
(psb_d_nest_rect_block), plus the per-block assembly wrappers.
- psb_d_nest_builder_mod: psb_d_nest_matrix, the user frontend with the
init/ins/asb/free pattern hiding all descriptor/halo/compose/setup
boilerplate.
- psb_d_nest_mod: umbrella module (use psb_d_nest_mod).
Remove the earlier bespoke per-block prototype (comm/psblas/vect modules and
the pde_nest_psblas test) superseded by the single MATNEST design.
Tests (test/nested): glob (square operator vs monolithic CSR oracle), rect
(genuinely rectangular blocks), cg (low-level path, ill-conditioned SPD
red-black Laplacian solved with standard CG), builder (same solve via the
utility), plus a README describing the design and usage. All pass serially
and in parallel, with results invariant to the process count.
Build hooks updated (autotools Makefiles + CMakeLists); the nested tests are
relocated out of test/pdegen into test/nested.
Author: Simone Staccone (Stack-1)
The nested layer was imported from an older base where the vector psb_spsm
still took a work buffer. communication_v2 removed work from the psb_x_vect_type
routines, so psb_dspsv_vect has no work argument and the call failed generic
resolution. Remove work from psb_d_nest_spsm (signature, declaration, call).
The configure step only searched MPI_Fortran_INCLUDE_PATH for mpi.mod, which
is empty for OpenMPI (the wrapper carries includes internally and ships mpi.mod
under lib/). mpi.mod was thus never copied into the module dir, and the
mpi.mod.stamp rule failed on a clean build. Also probe the wrapper
(--showme:inc/libdirs) and lib/ + include/ relative to the Fortran MPI
compiler. MPICH (used in CI) is unaffected.
base/CMakeLists.txt listed only psb_comm_rma_mod.F90 from comm_schemes,
omitting psb_comm_schemes_mod, psb_comm_baseline_mod, psb_comm_neighbor_impl_mod
and psb_comm_factory_mod, so their .mod files were never generated under CMake.
Also psb_comm_mod was listed as .F90 while the file is .f90 (breaks on
case-sensitive filesystems). The autotools Makefile was already correct.
Stack-1
jalmerol
sfilippone
Salvatore Filippone
Fabio Durastante