petsc-3.12.5 2020-03-29
PCASMSetTotalSubdomains
Sets the subdomains for all processors for the additive Schwarz preconditioner. Either all or no processors in the PC communicator must call this routine, with the same index sets.
Synopsis
#include "petscpc.h"
PetscErrorCode PCASMSetTotalSubdomains(PC pc,PetscInt N,IS is[],IS is_local[])
Collective on pc
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 NULL to ask PETSc to determine the subdomains)
|
| is_local | - the index sets that define the local part of the subdomains for this processor
(or NULL to not provide this information)
|
Options Database Key
To set the total number of subdomain blocks rather than specify the
index sets, use the option
-pc_asm_blocks <blks> -Sets total blocks
Notes
Currently you cannot use this to set the actual subdomains with the argument is or is_local.
By default the ASM preconditioner uses 1 block per processor.
These index sets cannot be destroyed until after completion of the
linear solves for which the ASM 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
PCASMSetLocalSubdomains(), PCASMSetOverlap(), PCASMGetSubKSP(),
PCASMCreateSubdomains2D()
Level
advanced
Location
src/ksp/pc/impls/asm/asm.c
Examples
src/ksp/ksp/examples/tutorials/ex8.c.html
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