Actual source code: ex7.c
1: /*$Id: ex7.c,v 1.30 2001/08/10 03:34:45 bsmith Exp $*/
3: static char help[] = "Tests DALocalToLocalxxx().\n\n";
5: #include petscda.h
6: #include petscsys.h
10: int main(int argc,char **argv)
11: {
12: int rank,M=8,ierr,dof=1,stencil_width=1,i,start,end,P=5;
13: PetscTruth flg,flg2,flg3;
14: int N = 6,m=PETSC_DECIDE,n=PETSC_DECIDE,p=PETSC_DECIDE;
15: DAPeriodicType periodic;
16: DAStencilType stencil_type;
17: DA da;
18: Vec local,global,local_copy;
19: PetscScalar value,mone = -1.0;
20: double norm,work;
21: PetscViewer viewer;
22: char filename[64];
23: FILE *file;
26: PetscInitialize(&argc,&argv,(char*)0,help);
28: PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
29: PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
30: PetscOptionsGetInt(PETSC_NULL,"-dof",&dof,PETSC_NULL);
31: PetscOptionsGetInt(PETSC_NULL,"-stencil_width",&stencil_width,PETSC_NULL);
32: PetscOptionsGetInt(PETSC_NULL,"-periodic",(int*)&periodic,PETSC_NULL);
33: PetscOptionsGetInt(PETSC_NULL,"-stencil_type",(int*)&stencil_type,PETSC_NULL);
35: PetscOptionsHasName(PETSC_NULL,"-2d",&flg2);
36: PetscOptionsHasName(PETSC_NULL,"-3d",&flg3);
37: if (flg2) {
38: DACreate2d(PETSC_COMM_WORLD,periodic,stencil_type,M,N,m,n,dof,stencil_width,
39: PETSC_NULL,PETSC_NULL,&da);
40: } else if (flg3) {
41: DACreate3d(PETSC_COMM_WORLD,periodic,stencil_type,M,N,P,m,n,p,dof,stencil_width,
42: PETSC_NULL,PETSC_NULL,PETSC_NULL,&da);
43: }
44: else {
45: DACreate1d(PETSC_COMM_WORLD,periodic,M,dof,stencil_width,PETSC_NULL,&da);
46: }
48: DACreateGlobalVector(da,&global);
49: DACreateLocalVector(da,&local);
50: VecDuplicate(local,&local_copy);
52:
53: /* zero out vectors so that ghostpoints are zero */
54: value = 0;
55: VecSet(&value,local);
56: VecSet(&value,local_copy);
58: VecGetOwnershipRange(global,&start,&end);
59: for (i=start; i<end; i++) {
60: value = i + 1;
61: VecSetValues(global,1,&i,&value,INSERT_VALUES);
62: }
63: VecAssemblyBegin(global);
64: VecAssemblyEnd(global);
66: DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
67: DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);
70: DALocalToLocalBegin(da,local,INSERT_VALUES,local_copy);
71: DALocalToLocalEnd(da,local,INSERT_VALUES,local_copy);
73: PetscOptionsHasName(PETSC_NULL,"-save",&flg);
74: if (flg) {
75: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
76: sprintf(filename,"local.%d",rank);
77: PetscViewerASCIIOpen(PETSC_COMM_SELF,filename,&viewer);
78: PetscViewerASCIIGetPointer(viewer,&file);
79: VecView(local,viewer);
80: fprintf(file,"Vector with correct ghost points\n");
81: VecView(local_copy,viewer);
82: PetscViewerDestroy(viewer);
83: }
85: VecAXPY(&mone,local,local_copy);
86: VecNorm(local_copy,NORM_MAX,&work);
87: MPI_Allreduce(&work,&norm,1,MPIU_REAL,MPI_MAX,PETSC_COMM_WORLD);
88: PetscPrintf(PETSC_COMM_WORLD,"Norm of difference %g should be zero\n",norm);
89:
90: VecDestroy(local_copy);
91: VecDestroy(local);
92: VecDestroy(global);
93: DADestroy(da);
94: PetscFinalize();
95: return 0;
96: }