Actual source code: ex6.c
1: /*$Id: ex6.c,v 1.48 2001/08/07 03:04:42 balay Exp $*/
2:
3: static char help[] = "Tests various 3-dimensional DA routines.\n\n";
5: #include petscda.h
6: #include petscsys.h
7: #include petscao.h
11: int main(int argc,char **argv)
12: {
13: int rank,M = 3,N = 5,P=3,s=1,w=2,nloc,l,i,j,k,kk;
14: int m = PETSC_DECIDE,n = PETSC_DECIDE,p = PETSC_DECIDE,ierr;
15: int Xs,Xm,Ys,Ym,Zs,Zm,iloc,*ltog,*iglobal;
16: int *lx = PETSC_NULL,*ly = PETSC_NULL,*lz = PETSC_NULL;
17: PetscTruth test_order;
18: DA da;
19: PetscViewer viewer;
20: Vec local,global;
21: PetscScalar value;
22: DAPeriodicType wrap = DA_XYPERIODIC;
23: DAStencilType stencil_type = DA_STENCIL_BOX;
24: AO ao;
25: PetscTruth flg;
27: PetscInitialize(&argc,&argv,(char*)0,help);
28: PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,400,300,&viewer);
30: /* Read options */
31: PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
32: PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
33: PetscOptionsGetInt(PETSC_NULL,"-P",&P,PETSC_NULL);
34: PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
35: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
36: PetscOptionsGetInt(PETSC_NULL,"-p",&p,PETSC_NULL);
37: PetscOptionsGetInt(PETSC_NULL,"-s",&s,PETSC_NULL);
38: PetscOptionsGetInt(PETSC_NULL,"-w",&w,PETSC_NULL);
39: PetscOptionsHasName(PETSC_NULL,"-star",&flg);
40: if (flg) stencil_type = DA_STENCIL_STAR;
41: PetscOptionsHasName(PETSC_NULL,"-test_order",&test_order);
43: PetscOptionsHasName(PETSC_NULL,"-distribute",&flg);
44: if (flg) {
45: if (m == PETSC_DECIDE) SETERRQ(1,"Must set -m option with -distribute option");
46: PetscMalloc(m*sizeof(int),&lx);
47: for (i=0; i<m-1; i++) { lx[i] = 4;}
48: lx[m-1] = M - 4*(m-1);
49: if (n == PETSC_DECIDE) SETERRQ(1,"Must set -n option with -distribute option");
50: PetscMalloc(n*sizeof(int),&ly);
51: for (i=0; i<n-1; i++) { ly[i] = 2;}
52: ly[n-1] = N - 2*(n-1);
53: if (p == PETSC_DECIDE) SETERRQ(1,"Must set -p option with -distribute option");
54: PetscMalloc(p*sizeof(int),&lz);
55: for (i=0; i<p-1; i++) { lz[i] = 2;}
56: lz[p-1] = P - 2*(p-1);
57: }
59: /* Create distributed array and get vectors */
60: DACreate3d(PETSC_COMM_WORLD,wrap,stencil_type,M,N,P,m,n,p,w,s,
61: lx,ly,lz,&da);
62: if (lx) {
63: PetscFree(lx);
64: PetscFree(ly);
65: PetscFree(lz);
66: }
67: DAView(da,viewer);
68: DACreateGlobalVector(da,&global);
69: DACreateLocalVector(da,&local);
71: /* Set global vector; send ghost points to local vectors */
72: value = 1;
73: VecSet(&value,global);
74: DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
75: DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);
77: /* Scale local vectors according to processor rank; pass to global vector */
78: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
79: value = rank;
80: VecScale(&value,local);
81: DALocalToGlobal(da,local,INSERT_VALUES,global);
83: if (!test_order) { /* turn off printing when testing ordering mappings */
84: if (M*N*P<40) {
85: PetscPrintf(PETSC_COMM_WORLD,"\nGlobal Vector:\n");
86: VecView(global,PETSC_VIEWER_STDOUT_WORLD);
87: PetscPrintf(PETSC_COMM_WORLD,"\n");
88: }
89: }
91: /* Send ghost points to local vectors */
92: DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
93: DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);
95: PetscOptionsHasName(PETSC_NULL,"-local_print",&flg);
96: if (flg) {
97: PetscViewer sviewer;
98: PetscSynchronizedPrintf(PETSC_COMM_WORLD,"\nLocal Vector: processor %d\n",rank);
99: PetscViewerGetSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
100: VecView(local,sviewer);
101: PetscViewerRestoreSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
102: PetscSynchronizedFlush(PETSC_COMM_WORLD);
103: }
105: /* Tests mappings betweeen application/PETSc orderings */
106: if (test_order) {
107: DAGetGhostCorners(da,&Xs,&Ys,&Zs,&Xm,&Ym,&Zm);
108: DAGetGlobalIndices(da,&nloc,<og);
109: DAGetAO(da,&ao);
110: /* AOView(ao,PETSC_VIEWER_STDOUT_WORLD); */
111: PetscMalloc(nloc*sizeof(int),&iglobal);
113: /* Set iglobal to be global indices for each processor's local and ghost nodes,
114: using the DA ordering of grid points */
115: kk = 0;
116: for (k=Zs; k<Zs+Zm; k++) {
117: for (j=Ys; j<Ys+Ym; j++) {
118: for (i=Xs; i<Xs+Xm; i++) {
119: iloc = w*((k-Zs)*Xm*Ym + (j-Ys)*Xm + i-Xs);
120: for (l=0; l<w; l++) {
121: iglobal[kk++] = ltog[iloc+l];
122: }
123: }
124: }
125: }
127: /* Map this to the application ordering (which for DAs is just the natural ordering
128: that would be used for 1 processor, numbering most rapidly by x, then y, then z) */
129: AOPetscToApplication(ao,nloc,iglobal);
131: /* Then map the application ordering back to the PETSc DA ordering */
132: AOApplicationToPetsc(ao,nloc,iglobal);
134: /* Verify the mappings */
135: kk=0;
136: for (k=Zs; k<Zs+Zm; k++) {
137: for (j=Ys; j<Ys+Ym; j++) {
138: for (i=Xs; i<Xs+Xm; i++) {
139: iloc = w*((k-Zs)*Xm*Ym + (j-Ys)*Xm + i-Xs);
140: for (l=0; l<w; l++) {
141: if (iglobal[kk] != ltog[iloc+l]) {
142: fprintf(stdout,"[%d] Problem with mapping: z=%d, j=%d, i=%d, l=%d, petsc1=%d, petsc2=%d\n",
143: rank,k,j,i,l,ltog[iloc+l],iglobal[kk]);
144: }
145: kk++;
146: }
147: }
148: }
149: }
150: PetscFree(iglobal);
151: }
153: /* Free memory */
154: PetscViewerDestroy(viewer);
155: VecDestroy(local);
156: VecDestroy(global);
157: DADestroy(da);
158: PetscFinalize();
159: return 0;
160: }
161: