petsc-3.7.1 2016-05-15
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MatStashSetInitialSize

sets the sizes of the matrix stash, that is used during the assembly process to store values that belong to other processors.

Synopsis

#include "petscmat.h" 
PetscErrorCode MatStashSetInitialSize(Mat mat,PetscInt size, PetscInt bsize)
Not Collective Many br

Input Parameters

mat - the matrix Many br
size - the initial size of the stash. Many br
bsize - the initial size of the block-stash(if used). Many br

Options Database Keys

-matstash_initial_size <size> or <size0,size1,...sizep- 1> Many br
-matstash_block_initial_size <bsize> or <bsize0,bsize1,...bsizep- 1> Many br

Many br

Notes

The block-stash is used for values set with MatSetValuesBlocked() while Many brthe stash is used for values set with MatSetValues() Many br

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

See Also

MatAssemblyBegin(), MatAssemblyEnd(), Mat, MatStashGetInfo()

Level:intermediate
Location:
src/mat/interface/matrix.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages