1: static char help[] = "Tests DMGetGlobalVector() and DMRestoreGlobalVector().\n\n";

  3: /*
  4: Use the options
  5:      -da_grid_x <nx> - number of grid points in x direction, if M < 0
  6:      -da_grid_y <ny> - number of grid points in y direction, if N < 0
  7:      -da_processors_x <MX> number of processors in x directio
  8:      -da_processors_y <MY> number of processors in x direction
  9: */

 11: #include <petscdm.h>
 12: #include <petscdmda.h>

 14: int main(int argc, char **argv)
 15: {
 16:   PetscInt        M = 10, N = 8;
 17:   PetscBool       flg = PETSC_FALSE;
 18:   DM              da;
 19:   Vec             global1, global2, global3;
 20:   DMBoundaryType  bx = DM_BOUNDARY_NONE, by = DM_BOUNDARY_NONE;
 21:   DMDAStencilType stype = DMDA_STENCIL_BOX;

 23:   PetscFunctionBeginUser;
 24:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
 25:   PetscCall(PetscOptionsGetBool(NULL, NULL, "-star_stencil", &flg, NULL));
 26:   if (flg) stype = DMDA_STENCIL_STAR;

 28:   /* Create distributed array and get vectors */
 29:   PetscCall(DMDACreate2d(PETSC_COMM_WORLD, bx, by, stype, M, N, PETSC_DECIDE, PETSC_DECIDE, 1, 1, NULL, NULL, &da));
 30:   PetscCall(DMSetFromOptions(da));
 31:   PetscCall(DMSetUp(da));
 32:   PetscCall(DMGetGlobalVector(da, &global1));
 33:   PetscCall(DMGetGlobalVector(da, &global2));
 34:   PetscCall(DMRestoreGlobalVector(da, &global1));
 35:   PetscCall(DMRestoreGlobalVector(da, &global2));
 36:   PetscCall(DMGetGlobalVector(da, &global1));
 37:   PetscCall(DMGetGlobalVector(da, &global3));
 38:   PetscCall(DMGetGlobalVector(da, &global2));
 39:   PetscCall(DMRestoreGlobalVector(da, &global1));
 40:   PetscCall(DMRestoreGlobalVector(da, &global3));
 41:   PetscCall(DMRestoreGlobalVector(da, &global2));
 42:   PetscCall(DMGetGlobalVector(da, &global1));
 43:   PetscCall(DMGetGlobalVector(da, &global3));
 44:   PetscCall(DMGetGlobalVector(da, &global2));
 45:   PetscCall(DMRestoreGlobalVector(da, &global1));
 46:   PetscCall(DMRestoreGlobalVector(da, &global3));
 47:   PetscCall(DMRestoreGlobalVector(da, &global2));
 48:   PetscCall(DMDestroy(&da));
 49:   PetscCall(PetscFinalize());
 50:   return 0;
 51: }

 53: /*TEST

 55:    test:

 57: TEST*/