PCCHOLESKY#
Uses a direct solver, based on Cholesky factorization, as a preconditioner
Options Database Keys#
-pc_factor_reuse_ordering - Activate
PCFactorSetReuseOrdering()-pc_factor_mat_solver_type - Actives
PCFactorSetMatSolverType()to choose the direct solver, like superlu-pc_factor_reuse_fill - Activates
PCFactorSetReuseFill()-pc_factor_fill
- Sets fill amount-pc_factor_in_place - Activates in-place factorization
-pc_factor_mat_ordering_type <nd,rcm,…> - Sets ordering routine
Notes#
Not all options work for all matrix formats
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#
KSP: Linear System Solvers, PCCreate(), PCSetType(), PCType, PC,
PCILU, PCLU, PCICC, PCFactorSetReuseOrdering(), PCFactorSetReuseFill(), PCFactorGetMatrix(),
PCFactorSetFill(), PCFactorSetShiftType(), PCFactorSetShiftAmount()
PCFactorSetUseInPlace(), PCFactorGetUseInPlace(), PCFactorSetMatOrderingType(), PCFactorSetReuseOrdering()
Level#
beginner
Location#
Examples#
src/tao/constrained/tutorials/ex1.c
src/ksp/pc/tutorials/ex4.c
src/ksp/ksp/tutorials/ex52.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages