petsc-3.3-p7 2013-05-11

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