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 - (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 - 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 - UMFPACK partial pivot tolerance: Control[UMFPACK_PIVOT_TOLERANCE]

  • -mat_umfpack_sym_pivot_tolerance <0.001> - Control[UMFPACK_SYM_PIVOT_TOLERANCE]

  • -mat_umfpack_scale - (choose one of) NONE SUM MAX

  • -mat_umfpack_alloc_init - UMFPACK factorized matrix allocation modifier: Control[UMFPACK_ALLOC_INIT]

  • -mat_umfpack_droptol <0> - Control[UMFPACK_DROPTOL]

  • -mat_umfpack_irstep - UMFPACK maximum number of iterative refinement steps: Control[UMFPACK_IRSTEP]

Note#

UMFPACK is part of SuiteSparse http://faculty.cse.tamu.edu/davis/suitesparse.html

See Also#

Matrices, Mat, PCLU, MATSOLVERSUPERLU, MATSOLVERMUMPS, PCFactorSetMatSolverType(), MatSolverType

Level#

beginner

Location#

src/mat/impls/aij/seq/umfpack/umfpack.c

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