3 Commits (fd60bb8d7fc05a851575627349fff0628261d87d)

Author	SHA1	Message	Date
Stack-1	8e02a99a11	[ADD] Stock preconditioners, configurable block format and full base-class contract for the nested matrix ... Complete the integration of the nested (MATNEST) operator into the standard PSBLAS infrastructure: - Preconditioners: implement get_diag and csgetrow on psb_d_nest_base_mat so the stock one-level preconditioners build directly on the nested operator (DIAG through the concatenated block diagonals, BJAC through the format-agnostic csget path used by the ILU factorizations). - Configurable block storage: psb_d_nest_rect_block and psb_d_nest_matrix%asb accept an optional type ('CSR' default, 'CSC', 'COO') or mold (any class extending psb_d_base_sparse_mat, e.g. the psb_ext ELL/HLL formats); the operator is format-agnostic since every operation delegates to the blocks. - Device-capable matvec: override vect_mv to gather/scatter through the vectors' own gth/sct with encapsulated index vectors (device kernels on device vectors) and to run each block through its vect_mv, so device block formats execute their native kernels; bit-equivalent to csmv on host. - Full psb_d_base_sparse_mat contract by delegation to the blocks: transposed csmv (dedicated kernel, ghost contributions left to the transposed halo exchange), multi-RHS csmm, cp_to_coo/mv_to_coo (unlocking cscnv, csclip, tril/triu through the base generics), rowsum/arwsum/colsum/aclsum, maxval/spnmi/spnm1, scal (left/right) and scals, clone (view semantics: shared blocks, re-owned index maps), mold, sizeof. cp_from_coo/mv_from_coo, csput and cssv/cssm are intentionally left to the base error (meaningless for a block-operator view), documented in the type and in the README. Tests: glob assembles the blocks in HLL (psb_ext) and rect in CSC, both still bit-identical to the monolithic CSR oracle; the CG test solves under NONE, DIAG and BJAC/ILU(0), requiring convergence to the exact solution for all of them and DIAG bit-identical to NONE (exactness check of the nested get_diag). README updated with the user API reference, the preconditioner section and the implemented-contract section. Author: Simone Staccone (Stack-1)	2 weeks ago
Stack-1	acdd2e9eb5	[ADD] Nested (MATNEST-style) block matrix support and tests ... 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)	2 weeks ago
jalmerol	b8d41569fd	Add double-precision nested block-structured matrix/vector layer	3 weeks ago