petsc-3.14.5 2021-03-03
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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

### See Also

VecSetBlockSize(), VecSetValues(), VecSetValuesBlocked(), VecStashView()

### Level

intermediate

### Location

src/vec/vec/interface/vector.c
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages