Actual source code: ex12.c
1: static char help[] = "Test DMStag 2d star stencil\n\n";
2: #include <petscdm.h>
3: #include <petscdmstag.h>
5: int main(int argc, char **argv)
6: {
7: DM dm;
8: Vec vec, vecLocal1, vecLocal2;
9: PetscScalar *a, ***a1, ***a2, expected, sum;
10: PetscInt startx, starty, nx, ny, i, j, d, is, js, dof0, dof1, dof2, dofTotal, stencilWidth, ngx, ngy;
11: DMBoundaryType boundaryTypex, boundaryTypey;
12: PetscMPIInt rank;
14: PetscFunctionBeginUser;
15: PetscCall(PetscInitialize(&argc, &argv, NULL, help));
16: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
17: dof0 = 1;
18: dof1 = 1;
19: dof2 = 1;
20: stencilWidth = 2;
21: PetscCall(DMStagCreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_PERIODIC, DM_BOUNDARY_PERIODIC, 4, 4, PETSC_DECIDE, PETSC_DECIDE, dof0, dof1, dof2, DMSTAG_STENCIL_STAR, stencilWidth, NULL, NULL, &dm));
22: PetscCall(DMSetFromOptions(dm));
23: PetscCall(DMSetUp(dm));
24: PetscCall(DMStagGetDOF(dm, &dof0, &dof1, &dof2, NULL));
25: dofTotal = dof0 + 2 * dof1 + dof2;
26: PetscCall(DMStagGetStencilWidth(dm, &stencilWidth));
28: PetscCall(DMCreateLocalVector(dm, &vecLocal1));
29: PetscCall(VecDuplicate(vecLocal1, &vecLocal2));
31: PetscCall(DMCreateGlobalVector(dm, &vec));
32: PetscCall(VecSet(vec, 1.0));
33: PetscCall(VecSet(vecLocal1, 0.0));
34: PetscCall(DMGlobalToLocalBegin(dm, vec, INSERT_VALUES, vecLocal1));
35: PetscCall(DMGlobalToLocalEnd(dm, vec, INSERT_VALUES, vecLocal1));
37: PetscCall(DMStagGetCorners(dm, &startx, &starty, NULL, &nx, &ny, NULL, NULL, NULL, NULL));
38: PetscCall(DMStagVecGetArrayRead(dm, vecLocal1, &a1));
39: PetscCall(DMStagVecGetArray(dm, vecLocal2, &a2));
40: for (j = starty; j < starty + ny; ++j) {
41: for (i = startx; i < startx + nx; ++i) {
42: for (d = 0; d < dofTotal; ++d) {
43: if (a1[j][i][d] != 1.0) PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] Unexpected value %g (expecting %g)\n", rank, (double)PetscRealPart(a1[j][i][d]), 1.0));
44: a2[j][i][d] = 0.0;
45: for (js = -stencilWidth; js <= stencilWidth; ++js) a2[j][i][d] += a1[j + js][i][d];
46: for (is = -stencilWidth; is <= stencilWidth; ++is) a2[j][i][d] += a1[j][i + is][d];
47: a2[j][i][d] -= a1[j][i][d];
48: }
49: }
50: }
51: PetscCall(DMStagVecRestoreArrayRead(dm, vecLocal1, &a1));
52: PetscCall(DMStagVecRestoreArray(dm, vecLocal2, &a2));
54: PetscCall(DMLocalToGlobalBegin(dm, vecLocal2, INSERT_VALUES, vec));
55: PetscCall(DMLocalToGlobalEnd(dm, vecLocal2, INSERT_VALUES, vec));
57: /* For the all-periodic case, some additional checks */
58: PetscCall(DMStagGetBoundaryTypes(dm, &boundaryTypex, &boundaryTypey, NULL));
59: if (boundaryTypex == DM_BOUNDARY_PERIODIC && boundaryTypey == DM_BOUNDARY_PERIODIC) {
60: PetscCall(DMStagGetGhostCorners(dm, NULL, NULL, NULL, &ngx, &ngy, NULL));
61: expected = (ngx * ngy - 4 * stencilWidth * stencilWidth) * dofTotal;
62: PetscCall(VecSum(vecLocal1, &sum));
63: if (sum != expected) PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] Unexpected sum of local entries %g (expected %g)\n", rank, (double)PetscRealPart(sum), (double)PetscRealPart(expected)));
65: PetscCall(VecGetArray(vec, &a));
66: expected = 1 + 4 * stencilWidth;
67: for (i = 0; i < ny * nx * dofTotal; ++i) {
68: if (a[i] != expected) PetscCall(PetscPrintf(PETSC_COMM_SELF, "[%d] Unexpected value %g (expecting %g)\n", rank, (double)PetscRealPart(a[i]), (double)PetscRealPart(expected)));
69: }
70: PetscCall(VecRestoreArray(vec, &a));
71: }
73: PetscCall(VecDestroy(&vec));
74: PetscCall(VecDestroy(&vecLocal1));
75: PetscCall(VecDestroy(&vecLocal2));
76: PetscCall(DMDestroy(&dm));
77: PetscCall(PetscFinalize());
78: return 0;
79: }
81: /*TEST
83: test:
84: suffix: 1
85: nsize: 4
86: args: -stag_ranks_x 2 -stag_ranks_y 2 -stag_stencil_width 1
88: test:
89: suffix: 2
90: nsize: 6
91: args: -stag_ranks_x 3 -stag_ranks_y 2 -stag_dof_0 2 -stag_grid_x 6
93: test:
94: suffix: 3
95: nsize: 4
96: args: -stag_dof_0 3 -stag_dof_1 2 -stag_dof_2 4 2 -stag_stencil_width 3 -stag_grid_x 6 -stag_grid_y 6
98: test:
99: suffix: 4
100: nsize: 4
101: args: -stag_stencil_width 1 -stag_grid_x 2 -stag_grid_y 2 -stag_boundary_type_x ghosted
103: test:
104: suffix: 5
105: nsize: 4
106: args: -stag_stencil_width 1 -stag_grid_x 2 -stag_grid_y 2 -stag_boundary_type_y ghosted
108: test:
109: suffix: 6
110: nsize: 4
111: args: -stag_stencil_width 1 -stag_grid_x 3 -stag_grid_y 2 -stag_boundary_type_x ghosted -stag_boundary_type_y ghosted
113: test:
114: suffix: 7
115: nsize: 4
116: args: -stag_stencil_width 1 -stag_grid_x 2 -stag_grid_y 2 -stag_boundary_type_y ghosted
118: test:
119: suffix: 8
120: nsize: 6
121: args: -stag_stencil_width 1 -stag_grid_y 2 -stag_grid_x 19 -stag_boundary_type_y ghosted -stag_ranks_x 6
122: TEST*/