MatStashSetInitialSize#
sets the sizes of the matrix stash, that is used during the assembly process to store values that belong to other processes.
Synopsis#
#include "petscmat.h"
PetscErrorCode MatStashSetInitialSize(Mat mat, PetscInt size, PetscInt bsize)
Not Collective
Input Parameters#
mat - the matrix
size - the initial size of the stash.
bsize - the initial size of the block-stash(if used).
Options Database Key#
-matstash_initial_size (size|size0,size1,…,sizep- 1) - set initial size of stash for all or each of the MPI processes, sets both block and non-block stash sizes
Notes#
The block-stash is used for values set with MatSetValuesBlocked() while
the stash is used for values set with MatSetValues()
Run with the option -info and look for output of the form
MatAssemblyBegin_MPIXXX:Stash has MM entries, uses nn mallocs.
to determine the appropriate value, MM, to use for size and
MatAssemblyBegin_MPIXXX:Block-Stash has BMM entries, uses nn mallocs.
to determine the value, BMM to use for bsize
See Also#
Matrices, MatAssemblyBegin(), MatAssemblyEnd(), Mat, MatStashGetInfo()
Level#
intermediate
Location#
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages