petsc-3.12.5 2020-03-29
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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 <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

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, PCLU, PCICC, PCFactorSetReuseOrdering(), PCFactorSetReuseFill(), PCFactorGetMatrix(), PCFactorSetFill(), PCFactorSetShiftNonzero(), PCFactorSetShiftType(), PCFactorSetShiftAmount() PCFactorSetUseInPlace(), PCFactorGetUseInPlace(), PCFactorSetMatOrderingType()

Level

beginner

Location

src/ksp/pc/impls/factor/cholesky/cholesky.c

Examples

src/ksp/ksp/examples/tutorials/ex52.c.html

Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages