:orphan:
# ISLocalToGlobalMappingGetBlockSize
Gets the blocksize of the mapping ordering and a global parallel ordering. 
## Synopsis
```
#include "petscis.h"  
PetscErrorCode ISLocalToGlobalMappingGetBlockSize(ISLocalToGlobalMapping mapping, PetscInt *bs)
```
Not Collective


## Input Parameter

- ***mapping -*** mapping data structure



## Output Parameter

- ***bs -*** the blocksize





## See Also
 [](sec_scatter), `ISLocalToGlobalMapping`, `ISLocalToGlobalMappingDestroy()`, `ISLocalToGlobalMappingCreateIS()`

## Level
advanced

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


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


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