| -pc_factor_reuse_ordering | - Activate PCFactorSetReuseOrdering() | |
| -pc_factor_mat_solver_package | - Actives PCFactorSetMatSolverPackage() to choose the direct solver, like spooles | |
| -pc_factor_reuse_fill | - Activates PCFactorSetReuseFill() | |
| -pc_factor_fill <fill> | - Sets fill amount | |
| -pc_factor_in_place | - Activates in-place factorization | |
| -pc_factor_mat_ordering_type <nd,rcm,...> | - Sets ordering routine | |
| -pc_factor_pivot_in_blocks <true,false> | - allow pivoting within the small blocks during factorization (may increase stability of factorization. | |
| -pc_factor_shift_type <shifttype> | - Sets shift type or PETSC_DECIDE for the default; use '-help' for a list of available types | |
| -pc_factor_shift_amount <shiftamount> | - Sets shift amount or PETSC_DECIDE for the default | |
| -pc_factor_nonzeros_along_diagonal | - permutes the rows and columns to try to put nonzero value along the diagonal. |
Notes: Not all options work for all matrix formats Run with -help to see additional options for particular matrix formats or factorization algorithms
Notes: Usually this will compute an "exact" solution in one iteration and does not need a Krylov method (i.e. you can use -ksp_type preonly, or KSPSetType(ksp,KSPPREONLY) for the Krylov method
Level:beginner
Location:src/ksp/pc/impls/factor/lu/lu.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages