| -pc_factor_levels <k> | - number of levels of fill for ILU(k) Many br | |
| -pc_factor_in_place | - only for ILU(0) with natural ordering, reuses the space of the matrix for Many brits factorization (overwrites original matrix) Many br | |
| -pc_factor_diagonal_fill | - fill in a zero diagonal even if levels of fill indicate it wouldn't be fill Many br | |
| -pc_factor_reuse_ordering | - reuse ordering of factorized matrix from previous factorization Many br | |
| -pc_factor_fill <nfill> | - expected amount of fill in factored matrix compared to original matrix, nfill > 1 Many br | |
| -pc_factor_nonzeros_along_diagonal | - reorder the matrix before factorization to remove zeros from the diagonal, Many brthis decreases the chance of getting a zero pivot Many br | |
| -pc_factor_mat_ordering_type <natural,nd,1wd,rcm,qmd> | - set the row/column ordering of the factored matrix Many br | |
| -pc_factor_pivot_in_blocks | - for block ILU(k) factorization, i.e. with BAIJ matrices with block size larger Many brthan 1 the diagonal blocks are factored with partial pivoting (this increases the Many brstability of the ILU factorization Many br |
Many br
Notes: Only implemented for some matrix formats. (for parallel see PCHYPRE for hypre's ILU) Many br
For BAIJ matrices this implements a point block ILU Many br
The "symmetric" application of this preconditioner is not actually symmetric since L is not transpose(U) Many breven when the matrix is not symmetric since the U stores the diagonals of the factorization. Many br
If you are using MATSEQAIJCUSPARSE matrices (or MATMPIAIJCUSPARESE matrices with block Jacobi), factorization Many bris never done on the GPU). Many br
| 1. | - T. Dupont, R. Kendall, and H. Rachford. An approximate factorization procedure for solving Many brself adjoint elliptic difference equations. SIAM J. Numer. Anal., 5, 1968. Many br | |
| 2. | - T.A. Oliphant. An implicit numerical method for solving two dimensional timedependent diffusion problems. Quart. Appl. Math., 19, 1961. Many br | |
| 3. | - TONY F. CHAN AND HENK A. VAN DER VORST, APPROXIMATE AND INCOMPLETE FACTORIZATIONS, Many brChapter in Parallel Numerical Many brAlgorithms, edited by D. Keyes, A. Semah, V. Venkatakrishnan, ICASE/LaRC Interdisciplinary Series in Many brScience and Engineering, Kluwer. Many br |
Level:beginner
Location:src/ksp/pc/impls/factor/ilu/ilu.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages