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# PetscLayoutGetBlockSize
Gets the block size for a `PetscLayout` object. 
## Synopsis
```
#include "petscis.h" 
PetscErrorCode PetscLayoutGetBlockSize(PetscLayout map, PetscInt *bs)
```
Not Collective


## Input Parameter

- ***map -*** pointer to the map



## Output Parameter

- ***bs -*** the size





## Notes
Call this after the call to `PetscLayoutSetUp()`


## See Also
 [PetscLayout](sec_matlayout), `PetscLayoutCreate()`, `PetscLayoutSetLocalSize()`, `PetscLayoutGetLocalSize()`, `PetscLayoutSetSize()`, `PetscLayoutSetUp()`
`PetscLayoutGetRange()`, `PetscLayoutGetRanges()`, `PetscLayoutSetBlockSize()`, `PetscLayoutGetSize()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/utils/pmap.c.html#PetscLayoutGetBlockSize">src/vec/is/utils/pmap.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/is/utils/pmap.c)


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