Actual source code: ex38.c


  2: static char help[] = "Tests DMGlobalToLocal() for 3d DA with stencil width of 2.\n\n";

  4: #include <petscdm.h>
  5: #include <petscdmda.h>

  7: int main(int argc, char **argv)
  8: {
  9:   PetscInt        N = 3, M = 2, P = 4, dof = 1, rstart, rend, i;
 10:   PetscInt        stencil_width = 2;
 11:   PetscMPIInt     rank;
 12:   DMBoundaryType  bx = DM_BOUNDARY_NONE, by = DM_BOUNDARY_NONE, bz = DM_BOUNDARY_NONE;
 13:   DMDAStencilType stencil_type = DMDA_STENCIL_STAR;
 14:   DM              da;
 15:   Vec             global, local;

 18:   PetscInitialize(&argc, &argv, (char *)0, help);
 19:   MPI_Comm_rank(PETSC_COMM_WORLD, &rank);
 20:   PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL);
 21:   PetscOptionsGetInt(NULL, NULL, "-N", &N, NULL);
 22:   PetscOptionsGetInt(NULL, NULL, "-P", &P, NULL);
 23:   PetscOptionsGetInt(NULL, NULL, "-dof", &dof, NULL);
 24:   PetscOptionsGetInt(NULL, NULL, "-stencil_width", &stencil_width, NULL);
 25:   PetscOptionsGetInt(NULL, NULL, "-stencil_type", (PetscInt *)&stencil_type, NULL);

 27:   DMDACreate3d(PETSC_COMM_WORLD, bx, by, bz, stencil_type, M, N, P, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE, dof, stencil_width, 0, 0, 0, &da);
 28:   DMSetFromOptions(da);
 29:   DMSetUp(da);
 30:   DMCreateGlobalVector(da, &global);
 31:   VecGetOwnershipRange(global, &rstart, &rend);
 32:   for (i = rstart; i < rend; i++) VecSetValue(global, i, (PetscReal)(i + 100 * rank), INSERT_VALUES);
 33:   VecAssemblyBegin(global);
 34:   VecAssemblyEnd(global);
 35:   DMCreateLocalVector(da, &local);
 36:   VecSet(local, -1);
 37:   DMGlobalToLocalBegin(da, global, INSERT_VALUES, local);
 38:   DMGlobalToLocalEnd(da, global, INSERT_VALUES, local);
 39:   if (rank == 0) VecView(local, 0);
 40:   DMDestroy(&da);
 41:   VecDestroy(&local);
 42:   VecDestroy(&global);
 43:   PetscFinalize();
 44:   return 0;
 45: }