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

  4: /*
  5: Use the options
  6:      -da_grid_x <nx> - number of grid points in x direction, if M < 0
  7:      -da_grid_y <ny> - number of grid points in y direction, if N < 0
  8:      -da_processors_x <MX> number of processors in x directio
  9:      -da_processors_y <MY> number of processors in x direction
 10: */

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

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

 25:   PetscInitialize(&argc, &argv, (char *)0, help);
 26:   PetscOptionsGetBool(NULL, NULL, "-star_stencil", &flg, NULL);
 27:   if (flg) stype = DMDA_STENCIL_STAR;

 29:   /* Create distributed array and get vectors */
 30:   DMDACreate2d(PETSC_COMM_WORLD, bx, by, stype, M, N, PETSC_DECIDE, PETSC_DECIDE, 1, 1, NULL, NULL, &da);
 31:   DMSetFromOptions(da);
 32:   DMSetUp(da);
 33:   DMGetGlobalVector(da, &global1);
 34:   DMGetGlobalVector(da, &global2);
 35:   DMRestoreGlobalVector(da, &global1);
 36:   DMRestoreGlobalVector(da, &global2);
 37:   DMGetGlobalVector(da, &global1);
 38:   DMGetGlobalVector(da, &global3);
 39:   DMGetGlobalVector(da, &global2);
 40:   DMRestoreGlobalVector(da, &global1);
 41:   DMRestoreGlobalVector(da, &global3);
 42:   DMRestoreGlobalVector(da, &global2);
 43:   DMGetGlobalVector(da, &global1);
 44:   DMGetGlobalVector(da, &global3);
 45:   DMGetGlobalVector(da, &global2);
 46:   DMRestoreGlobalVector(da, &global1);
 47:   DMRestoreGlobalVector(da, &global3);
 48:   DMRestoreGlobalVector(da, &global2);
 49:   DMDestroy(&da);
 50:   PetscFinalize();
 51:   return 0;
 52: }

 54: /*TEST

 56:    test:

 58: TEST*/