petsc-3.14.1 2020-11-03
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PCFactorSetMatOrderingType

Sets the ordering routine (to reduce fill) to be used in the LU, ILU, Cholesky, and ICC factorizations.

Synopsis

#include "petscpc.h" 
PetscErrorCode  PCFactorSetMatOrderingType(PC pc,MatOrderingType ordering)
Logically Collective on PC

Input Parameters

pc - the preconditioner context
ordering - the matrix ordering name, for example, MATORDERINGND or MATORDERINGRCM

Options Database Key

-pc_factor_mat_ordering_type <nd,rcm,...,external> - Sets ordering routine

Notes

nested dissection is used by default

For Cholesky and ICC and the SBAIJ format the only reordering available is natural since only the upper half of the matrix is stored and reordering this matrix is very expensive.

You can use SeqAIJ matrix with Cholesky and ICC and use any ordering

external means PETSc will not compute an ordering and the package will use its own ordering, for MATSOLVERCHOLMOD and MATSOLVERUMFPACK

See Also

MatOrderingType

Level

intermediate

Location

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

Implementations

PCFactorSetMatOrderingType_Factor in src/ksp/pc/impls/factor/factimpl.c

Index of all PC routines
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Index of all manual pages