PCLU

Uses a direct solver, based on LU factorization, as a preconditioner

Options Database Keys

-pc_lu_reuse_ordering - Activate PCLUSetReuseOrdering()
-pc_lu_reuse_fill - Activates PCLUSetReuseFill()
-pc_lu_fill <fill> - Sets fill amount
-pc_lu_damping <damping> - Sets damping amount
-pc_lu_in_place - Activates in-place factorization
-pc_lu_mat_ordering_type <nd,rcm,...> - Sets ordering routine
-pc_lu_pivoting - dttol
-pc_lu_pivot_in_blocks <true,false>- 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

See Also

PCCreate(), PCSetType(), PCType (for list of available types), PC,
PCILU, PCCHOLESKY, PCICC, PCLUSetReuseOrdering(), PCLUSetReuseFill(), PCGetFactoredMatrix(), PCLUSetFill(), PCLUSetDamping(), PCLUSetUseInPlace(), PCLUSetMatOrdering(), PCLUSetPivoting(), PCLUSetPivotingInBlocks()

Level:beginner
Location:
src/sles/pc/impls/lu/lu.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/sles/examples/tutorials/ex13.c.html
src/sles/examples/tutorials/ex13f90.F.html