petsc-3.14.5 2021-03-03
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# PCGASMSetUseDMSubdomains

Indicates whether to use DMCreateDomainDecomposition() to define the subdomains, whenever possible. Logically Collective

### Synopsis

    #include "petscpc.h"
    PetscErrorCode  PCGASMSetUseDMSubdomains(PC pc,PetscBool flg)

### Input Parameter

| pc | - the preconditioner
| flg | - boolean indicating whether to use subdomains defined by the DM

### Options Database Key

| -pc_gasm_dm_subdomains | - pc_gasm_overlap -pc_gasm_total_subdomains

### Notes

PCGASMSetSubdomains(), PCGASMSetTotalSubdomains() or PCGASMSetOverlap() take precedence over PCGASMSetUseDMSubdomains(), so setting PCGASMSetSubdomains() with nontrivial subdomain ISs or any of PCGASMSetTotalSubdomains() and PCGASMSetOverlap() automatically turns the latter off.

### See Also

PCGASMGetUseDMSubdomains(), PCGASMSetSubdomains(), PCGASMSetOverlap()
PCGASMCreateSubdomains2D()

### Level

intermediate

### Location

src/ksp/pc/impls/gasm/gasm.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages