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

See Also

KSP: Linear System Solvers, PCGASM, PCGASMSetSubdomains(), PCGASMGetSubKSP(), PCGASMSetOverlap(), PCASMCreateSubdomains2D(), PCGASMDestroySubdomains()

Level

advanced

Location

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

Examples

src/ksp/ksp/tutorials/ex62.c

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