petsc-3.14.5 2021-03-03
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# PCBJacobiSetLocalBlocks

Sets the local number of blocks for the block Jacobi preconditioner.

### Synopsis

    #include "petscpc.h"
    PetscErrorCode  PCBJacobiSetLocalBlocks(PC pc,PetscInt blocks,const PetscInt lens[])

Not Collective

### Input Parameters

| pc | - the preconditioner context
| blocks | - the number of blocks
| lens | - [optional] integer array containing size of each block

### Options Database Key

| -pc_bjacobi_local_blocks <blocks> | - Sets the number of local blocks

### Note

Currently only a limited number of blocking configurations are supported.

### See Also

PCSetUseAmat(), PCBJacobiSetTotalBlocks()

### Level

intermediate

### Location

src/ksp/pc/impls/bjacobi/bjacobi.c

### Examples

src/ksp/ksp/tutorials/ex7.c.html
src/ksp/ksp/tutorials/ex7f.F90.html

### Implementations

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