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 CHKERRQ(VecDuplicate(gc1,&tmp)); 13 CHKERRQ(VecWAXPY(tmp,-1.0,gc1,gc2)); 14 CHKERRQ(VecNorm(tmp,NORM_INFINITY,&nrm)); 15 CHKERRMPI(MPI_Allreduce(&nrm,&gnrm,1,MPIU_REAL,MPIU_MAX,PETSC_COMM_WORLD)); 16 CHKERRQ(PetscPrintf(PETSC_COMM_WORLD,"norm of difference of ghosted coordinates %8.2e\n",gnrm)); 17 CHKERRQ(VecDestroy(&tmp)); 18 PetscFunctionReturn(0); 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 CHKERRQ(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 CHKERRQ(DMSetFromOptions(Q2_da)); 33 CHKERRQ(DMSetUp(Q2_da)); 34 CHKERRQ(DMDASetUniformCoordinates(Q2_da,-1.0,1.0,-2.0,2.0,-3.0,3.0)); 35 CHKERRQ(DMGetCoordinates(Q2_da,&coords)); 36 CHKERRQ(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 CHKERRQ(DMSetFromOptions(Q1_da)); 38 CHKERRQ(DMSetUp(Q1_da)); 39 CHKERRQ(DMSetCoordinates(Q1_da,coords)); 40 41 /* Get ghost coordinates one way */ 42 CHKERRQ(DMGetCoordinatesLocal(Q1_da,&gcoords)); 43 44 /* And another */ 45 CHKERRQ(DMGetCoordinates(Q1_da,&coords)); 46 CHKERRQ(DMGetCoordinateDM(Q1_da,&cda)); 47 CHKERRQ(DMGetLocalVector(cda,&gcoords2)); 48 CHKERRQ(DMGlobalToLocalBegin(cda,coords,INSERT_VALUES,gcoords2)); 49 CHKERRQ(DMGlobalToLocalEnd(cda,coords,INSERT_VALUES,gcoords2)); 50 51 CHKERRQ(CompareGhostedCoords(gcoords,gcoords2)); 52 CHKERRQ(DMRestoreLocalVector(cda,&gcoords2)); 53 54 CHKERRQ(VecScale(coords,10.0)); 55 CHKERRQ(VecScale(gcoords,10.0)); 56 CHKERRQ(DMGetCoordinatesLocal(Q1_da,&gcoords2)); 57 CHKERRQ(CompareGhostedCoords(gcoords,gcoords2)); 58 59 CHKERRQ(DMDestroy(&Q2_da)); 60 CHKERRQ(DMDestroy(&Q1_da)); 61 PetscFunctionReturn(0); 62 } 63 64 int main(int argc,char **argv) 65 { 66 67 CHKERRQ(PetscInitialize(&argc,&argv,0,help)); 68 CHKERRQ(TestQ2Q1DA()); 69 CHKERRQ(PetscFinalize()); 70 return 0; 71 } 72 73 /*TEST 74 75 test: 76 nsize: 2 77 78 TEST*/ 79