#include "petscpc.h" PetscErrorCode PCASMSetOverlap(PC pc,PetscInt ovl)Logically Collective on PC
|pc||- the preconditioner context|
|ovl||- the amount of overlap between subdomains (ovl >= 0, default value = 1)|
The overlap defaults to 1, so if one desires that no additional overlap be computed beyond what may have been set with a call to PCASMSetTotalSubdomains() or PCASMSetLocalSubdomains(), then ovl must be set to be 0. In particular, if one does not explicitly set the subdomains an application code, then all overlap would be computed internally by PETSc, and using an overlap of 0 would result in an ASM variant that is equivalent to the block Jacobi preconditioner.
Note that one can define initial index sets with any overlap via PCASMSetTotalSubdomains() or PCASMSetLocalSubdomains(); the routine PCASMSetOverlap() merely allows PETSc to extend that overlap further if desired.
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages