petsc-3.14.5 2021-03-03
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# VecCreateShared

Creates a parallel vector that uses shared memory.

### Synopsis

    #include "petscvec.h"
    PetscErrorCode  VecCreateShared(MPI_Comm comm,PetscInt n,PetscInt N,Vec *v)

### Input Parameters

| comm | - the MPI communicator to use
| n | - local vector length (or PETSC_DECIDE to have calculated if N is given)
| N | - global vector length (or PETSC_DECIDE to have calculated if n is given)

### Output Parameter

| vv | - the vector

Collective

### Notes

Currently VecCreateShared() is available only on the SGI; otherwise, this routine is the same as VecCreateMPI().

Use VecDuplicate() or VecDuplicateVecs() to form additional vectors of the same type as an existing vector.

### See Also

VecCreateSeq(), VecCreate(), VecCreateMPI(), VecDuplicate(), VecDuplicateVecs(),
VecCreateGhost(), VecCreateMPIWithArray(), VecCreateGhostWithArray()

### Level

advanced

### Location

src/vec/vec/impls/shared/shvec.c

### Examples

src/vec/vec/tutorials/ex1.c.html
src/vec/vec/tutorials/ex11.c.html
src/vec/vec/tutorials/ex1f.F90.html
src/vec/vec/tutorials/ex11f.F.html
src/vec/vec/tutorials/ex11f90.F90.html
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages