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#
Examples#
src/dm/impls/stag/tutorials/ex4.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages