1 static char help[] = "Tests DMDA ghost coordinates\n\n"; 2 3 #include <petscdm.h> 4 #include <petscdmda.h> 5 6 static PetscErrorCode CompareGhostedCoords(Vec gc1, Vec gc2) 7 { 8 PetscReal nrm, gnrm; 9 Vec tmp; 10 11 PetscFunctionBeginUser; 12 PetscCall(VecDuplicate(gc1, &tmp)); 13 PetscCall(VecWAXPY(tmp, -1.0, gc1, gc2)); 14 PetscCall(VecNorm(tmp, NORM_INFINITY, &nrm)); 15 PetscCallMPI(MPI_Allreduce(&nrm, &gnrm, 1, MPIU_REAL, MPIU_MAX, PETSC_COMM_WORLD)); 16 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "norm of difference of ghosted coordinates %8.2e\n", (double)gnrm)); 17 PetscCall(VecDestroy(&tmp)); 18 PetscFunctionReturn(PETSC_SUCCESS); 19 } 20 21 static PetscErrorCode TestQ2Q1DA(void) 22 { 23 DM Q2_da, Q1_da, cda; 24 PetscInt mx, my, mz; 25 Vec coords, gcoords, gcoords2; 26 27 PetscFunctionBeginUser; 28 mx = 7; 29 my = 11; 30 mz = 13; 31 PetscCall(DMDACreate3d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DMDA_STENCIL_BOX, mx, my, mz, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE, 3, 2, 0, 0, 0, &Q2_da)); 32 PetscCall(DMSetFromOptions(Q2_da)); 33 PetscCall(DMSetUp(Q2_da)); 34 PetscCall(DMDASetUniformCoordinates(Q2_da, -1.0, 1.0, -2.0, 2.0, -3.0, 3.0)); 35 PetscCall(DMGetCoordinates(Q2_da, &coords)); 36 PetscCall(DMDACreate3d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DMDA_STENCIL_BOX, mx, my, mz, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE, 3, 1, 0, 0, 0, &Q1_da)); 37 PetscCall(DMSetFromOptions(Q1_da)); 38 PetscCall(DMSetUp(Q1_da)); 39 PetscCall(DMSetCoordinates(Q1_da, coords)); 40 41 /* Get ghost coordinates one way */ 42 PetscCall(DMGetCoordinatesLocal(Q1_da, &gcoords)); 43 44 /* And another */ 45 PetscCall(DMGetCoordinates(Q1_da, &coords)); 46 PetscCall(DMGetCoordinateDM(Q1_da, &cda)); 47 PetscCall(DMGetLocalVector(cda, &gcoords2)); 48 PetscCall(DMGlobalToLocalBegin(cda, coords, INSERT_VALUES, gcoords2)); 49 PetscCall(DMGlobalToLocalEnd(cda, coords, INSERT_VALUES, gcoords2)); 50 51 PetscCall(CompareGhostedCoords(gcoords, gcoords2)); 52 PetscCall(DMRestoreLocalVector(cda, &gcoords2)); 53 54 PetscCall(VecScale(coords, 10.0)); 55 PetscCall(VecScale(gcoords, 10.0)); 56 PetscCall(DMGetCoordinatesLocal(Q1_da, &gcoords2)); 57 PetscCall(CompareGhostedCoords(gcoords, gcoords2)); 58 59 PetscCall(DMDestroy(&Q2_da)); 60 PetscCall(DMDestroy(&Q1_da)); 61 PetscFunctionReturn(PETSC_SUCCESS); 62 } 63 64 int main(int argc, char **argv) 65 { 66 PetscFunctionBeginUser; 67 PetscCall(PetscInitialize(&argc, &argv, 0, help)); 68 PetscCall(TestQ2Q1DA()); 69 PetscCall(PetscFinalize()); 70 return 0; 71 } 72 73 /*TEST 74 75 test: 76 nsize: 2 77 78 TEST*/ 79