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# DMPlexDistributeOverlap
Add partition overlap to a distributed non-overlapping `DM`. 
## Synopsis
```
#include "petscdmplex.h"   
#include "petscdmlabel.h"  
PetscErrorCode DMPlexDistributeOverlap(DM dm, PetscInt overlap, PetscSF *sf, DM *dmOverlap)
```
Collective


## Input Parameters

- ***dm  -*** The non-overlapping distributed `DMPLEX` object
- ***overlap -*** The overlap of partitions (the same on all ranks)



## Output Parameters

- ***sf -*** The `PetscSF` used for point distribution
- ***dmOverlap -*** The overlapping distributed `DMPLEX` object, or `NULL`



## Options Database Keys

- ***-dm_plex_overlap_labels <name1,name2,...> -*** List of overlap label names
- ***-dm_plex_overlap_values <int1,int2,...>   -*** List of overlap label values
- ***-dm_plex_overlap_exclude_label <name>     -*** Label used to exclude points from overlap
- ***-dm_plex_overlap_exclude_value <int>      -*** Label value used to exclude points from overlap





## Notes
If the mesh was not distributed, the return value is `NULL`.

The user can control the definition of adjacency for the mesh using `DMSetAdjacency()`. They should choose the combination appropriate for the function
representation on the mesh.


## See Also
 `DMPLEX`, `PetscSF`, `DM`, `DMPlexCreate()`, `DMSetAdjacency()`, `DMPlexDistribute()`, `DMPlexCreateOverlapLabel()`, `DMPlexGetOverlap()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/plexdistribute.c.html#DMPlexDistributeOverlap">src/dm/impls/plex/plexdistribute.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/plex/plexdistribute.c)


[Index of all DMPlex routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)