petsc-3.7.5 2017-01-01
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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_package - Actives PCFactorSetMatSolverPackage() 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
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages

Examples

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