:orphan:
# DMGetBlockingType
get the blocking granularity to be used for variable block size `DMCreateMatrix()` is called 
## Synopsis
```
#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMGetBlockingType(DM dm, DMBlockingType *btype)
```
Not Collective


## Input Parameter

- ***dm -*** the `DM`



## Output Parameter

- ***btype -*** block by topological point or field node





## See Also
 [](ch_dmbase), `DM`, `DMCreateMatrix()`, `MatSetVariableBlockSizes()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/interface/dm.c.html#DMGetBlockingType">src/dm/interface/dm.c</A>


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


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