petsc-3.10.5 2019-03-28
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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

### Input Parameters

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

### Options Database Keys

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

### 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

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