PCGAMGSetReuseInterpolation

Reuse prolongation when rebuilding a PCGAMG algebraic multigrid preconditioner

Synopsis

#include "petscpc.h" 
#include "petscksp.h" 
PetscErrorCode PCGAMGSetReuseInterpolation(PC pc, PetscBool n)

Collective

Input Parameters

• pc - the preconditioner context

• n - PETSC_TRUE or PETSC_FALSE

Options Database Key

• -pc_gamg_reuse_interpolation <true,false> - reuse the previous interpolation

Note

May negatively affect the convergence rate of the method on new matrices if the matrix entries change a great deal, but allows rebuilding the preconditioner quicker.

See Also

the Users Manual section on PCGAMG, the Users Manual section on PCMG, KSP: Linear System Solvers, PCGAMG

Level

intermediate

Location

src/ksp/pc/impls/gamg/gamg.c

Implementations

PCGAMGSetReuseInterpolation_GAMG() in src/ksp/pc/impls/gamg/gamg.c

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