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# VecSetBlockSize
Sets the block size for future calls to `VecSetValuesBlocked()` and `VecSetValuesBlockedLocal()`.
## Synopsis
```
#include "petscvec.h"
PetscErrorCode VecSetBlockSize(Vec v, PetscInt bs)
```
Logically Collective
## Input Parameters
- ***v -*** the vector
- ***bs -*** the blocksize
## Note
All vectors obtained by `VecDuplicate()` inherit the same blocksize.
Vectors obtained with `DMCreateGlobalVector()` and `DMCreateLocalVector()` generally already have a blocksize set based on the state of the `DM`
## See Also
[](ch_vectors), `Vec`, `VecSetValuesBlocked()`, `VecSetLocalToGlobalMapping()`, `VecGetBlockSize()`
## Level
advanced
## Location
src/vec/vec/interface/vector.c
## Examples
src/dm/field/tutorials/ex1.c
src/ksp/ksp/tutorials/ex56.c
src/ksp/ksp/tutorials/ex73.c
src/tao/tutorials/ex3.c
src/vec/vec/tutorials/ex11.c
src/vec/vec/tutorials/ex11f.F90
src/vec/vec/tutorials/ex11f90.F90
src/vec/vec/tutorials/ex12.c
src/vec/vec/tutorials/ex12f.F90
src/vec/vec/tutorials/ex13.c
src/vec/vec/tutorials/ex16.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/vec/interface/vector.c)
[Index of all Vec routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)