PCGASMCreateSubdomains2D#

Creates the index sets for the PCGASM overlapping Schwarz preconditioner for a two-dimensional problem on a regular grid.

Synopsis#

#include "petscpc.h" 
PetscErrorCode PCGASMCreateSubdomains2D(PC pc, PetscInt M, PetscInt N, PetscInt Mdomains, PetscInt Ndomains, PetscInt dof, PetscInt overlap, PetscInt *nsub, IS **iis, IS **ois)

Collective

Input Parameters#

  • pc - the preconditioner context

  • M - the global number of grid points in the x direction

  • N - the global number of grid points in the y direction

  • Mdomains - the global number of subdomains in the x direction

  • Ndomains - the global number of subdomains in the y direction

  • dof - degrees of freedom per node

  • overlap - overlap in mesh lines

Output Parameters#

  • Nsub - the number of local subdomains created

  • iis - array of index sets defining inner (nonoverlapping) subdomains

  • ois - array of index sets defining outer (overlapping, if overlap > 0) subdomains

Note#

Use PCGASMDestroySubdomains() to free the index sets and the arrays

Fortran Note#

The IS must be declared as an array of length long enough to hold Nsub entries

See Also#

PCGASM, PCGASMSetSubdomains(), PCGASMGetSubKSP(), PCGASMSetOverlap(), PCASMCreateSubdomains2D(), PCGASMDestroySubdomains()

Level#

advanced

Location#

src/ksp/pc/impls/gasm/gasm.c

Examples#

src/ksp/ksp/tutorials/ex62.c
src/ksp/ksp/tutorials/ex64.c

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