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# VecStashSetInitialSize
sets the sizes of the vec-stash, that is used during the assembly process to store values that belong to other processors. 
## Synopsis
```
#include "petscvec.h"   
PetscErrorCode VecStashSetInitialSize(Vec vec, PetscInt size, PetscInt bsize)
```
Not Collective, different processes can have different size stashes


## Input Parameters

- ***vec   -*** the vector
- ***size  -*** the initial size of the stash.
- ***bsize -*** the initial size of the block-stash(if used).



## Options Database Keys

- ***-vecstash_initial_size <size> or <size0,size1,...sizep-*** 1>
- ***-vecstash_block_initial_size <bsize> or <bsize0,bsize1,...bsizep-*** 1>





## Notes
The block-stash is used for values set with `VecSetValuesBlocked()` while
the stash is used for values set with `VecSetValues()`

Run with the option -info and look for output of the form
VecAssemblyBegin_MPIXXX:Stash has MM entries, uses nn mallocs.
to determine the appropriate value, MM, to use for size and
VecAssemblyBegin_MPIXXX:Block-Stash has BMM entries, uses nn mallocs.
to determine the value, BMM to use for bsize

PETSc attempts to smartly manage the stash size so there is little likelihood setting a
a specific value here will affect performance


## See Also
 [](ch_vectors), `Vec`, `VecSetBlockSize()`, `VecSetValues()`, `VecSetValuesBlocked()`, `VecStashView()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/interface/vector.c.html#VecStashSetInitialSize">src/vec/vec/interface/vector.c</A>


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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)  
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