Actual source code: ex32.c
1: static char help[] = "Tests DMDA ghost coordinates\n\n";
3: #include <petscdm.h>
4: #include <petscdmda.h>
6: static PetscErrorCode CompareGhostedCoords(Vec gc1,Vec gc2)
7: {
8: PetscReal nrm,gnrm;
9: Vec tmp;
12: VecDuplicate(gc1,&tmp);
13: VecWAXPY(tmp,-1.0,gc1,gc2);
14: VecNorm(tmp,NORM_INFINITY,&nrm);
15: MPI_Allreduce(&nrm,&gnrm,1,MPIU_REAL,MPIU_MAX,PETSC_COMM_WORLD);
16: PetscPrintf(PETSC_COMM_WORLD,"norm of difference of ghosted coordinates %8.2e\n",gnrm);
17: VecDestroy(&tmp);
18: return 0;
19: }
21: static PetscErrorCode TestQ2Q1DA(void)
22: {
23: DM Q2_da,Q1_da,cda;
24: PetscInt mx,my,mz;
25: Vec coords,gcoords,gcoords2;
28: mx = 7;
29: my = 11;
30: mz = 13;
31: 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: DMSetFromOptions(Q2_da);
33: DMSetUp(Q2_da);
34: DMDASetUniformCoordinates(Q2_da,-1.0,1.0,-2.0,2.0,-3.0,3.0);
35: DMGetCoordinates(Q2_da,&coords);
36: 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: DMSetFromOptions(Q1_da);
38: DMSetUp(Q1_da);
39: DMSetCoordinates(Q1_da,coords);
41: /* Get ghost coordinates one way */
42: DMGetCoordinatesLocal(Q1_da,&gcoords);
44: /* And another */
45: DMGetCoordinates(Q1_da,&coords);
46: DMGetCoordinateDM(Q1_da,&cda);
47: DMGetLocalVector(cda,&gcoords2);
48: DMGlobalToLocalBegin(cda,coords,INSERT_VALUES,gcoords2);
49: DMGlobalToLocalEnd(cda,coords,INSERT_VALUES,gcoords2);
51: CompareGhostedCoords(gcoords,gcoords2);
52: DMRestoreLocalVector(cda,&gcoords2);
54: VecScale(coords,10.0);
55: VecScale(gcoords,10.0);
56: DMGetCoordinatesLocal(Q1_da,&gcoords2);
57: CompareGhostedCoords(gcoords,gcoords2);
59: DMDestroy(&Q2_da);
60: DMDestroy(&Q1_da);
61: return 0;
62: }
64: int main(int argc,char **argv)
65: {
67: PetscInitialize(&argc,&argv,0,help);
68: TestQ2Q1DA();
69: PetscFinalize();
70: return 0;
71: }
73: /*TEST
75: test:
76: nsize: 2
78: TEST*/