MATSOLVERUMFPACK#

“umfpack” - A matrix type providing direct solvers, LU, for sequential matrices via the external package UMFPACK. Use ./configure --download-suitesparse to install PETSc to use UMFPACK

Use -pc_type lu -pc_factor_mat_solver_type umfpack to use this direct solver

Consult UMFPACK documentation for more information about the Control parameters which correspond to the options database keys below.

Options Database Keys#

-mat_umfpack_ordering - CHOLMOD, AMD, GIVEN, METIS, BEST, NONE
-mat_umfpack_prl - UMFPACK print level: Control[UMFPACK_PRL]
-mat_umfpack_strategy AUTO - (choose one of) AUTO, UNSYMMETRIC, SYMMETRIC 2BY2
-mat_umfpack_dense_col alpha_c - UMFPACK dense column threshold: Control[UMFPACK_DENSE_COL]
-mat_umfpack_dense_row 0.2 - Control[UMFPACK_DENSE_ROW]
-mat_umfpack_amd_dense 10 - Control[UMFPACK_AMD_DENSE]
-mat_umfpack_block_size bs - UMFPACK block size for BLAS-Level 3 calls: Control[UMFPACK_BLOCK_SIZE]
-mat_umfpack_2by2_tolerance 0.01 - Control[UMFPACK_2BY2_TOLERANCE]
-mat_umfpack_fixq 0 - Control[UMFPACK_FIXQ]
-mat_umfpack_aggressive 1 - Control[UMFPACK_AGGRESSIVE]
-mat_umfpack_pivot_tolerance delta - UMFPACK partial pivot tolerance: Control[UMFPACK_PIVOT_TOLERANCE]
-mat_umfpack_sym_pivot_tolerance 0.001 - Control[UMFPACK_SYM_PIVOT_TOLERANCE]
-mat_umfpack_scale NONE - (choose one of) NONE SUM MAX
-mat_umfpack_alloc_init delta - UMFPACK factorized matrix allocation modifier: Control[UMFPACK_ALLOC_INIT]
-mat_umfpack_droptol 0 - Control[UMFPACK_DROPTOL]
-mat_umfpack_irstep 0 - UMFPACK maximum number of iterative refinement steps: Control[UMFPACK_IRSTEP]