PCASMSetTotalSubdomains#
Sets the subdomains for all processors for the additive Schwarz preconditioner, PCASM.
Synopsis#
#include "petscpc.h"
PetscErrorCode PCASMSetTotalSubdomains(PC pc, PetscInt N, IS is[], IS is_local[])
Collective, all MPI ranks must pass in the same array of IS
Input Parameters#
pc - the preconditioner context
N - the number of subdomains for all processors
is - the index sets that define the subdomains for all processors (or
NULLto ask PETSc to determine the subdomains)is_local - the index sets that define the local part of the subdomains for this processor (or
NULLto not provide this information)
Options Database Key#
-pc_asm_blocks
- Sets total blocks
Notes#
Currently you cannot use this to set the actual subdomains with the argument is or is_local.
By default the PCASM preconditioner uses 1 block per processor.
These index sets cannot be destroyed until after completion of the
linear solves for which the PCASM preconditioner is being used.
Use PCASMSetLocalSubdomains() to set local subdomains.
The IS numbering is in the parallel, global numbering of the vector for both is and is_local
See Also#
KSP: Linear System Solvers, PCASM, PCASMSetLocalSubdomains(), PCASMSetOverlap(), PCASMGetSubKSP(),
PCASMCreateSubdomains2D(), PCGASM
Level#
advanced
Location#
Implementations#
PCASMSetTotalSubdomains_ASM() in src/ksp/pc/impls/asm/asm.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages