Actual source code: ex4.c
1: /*$Id: ex4.c,v 1.53 2001/08/07 03:04:42 balay Exp $*/
2:
3: static char help[] = "Tests various 2-dimensional DA routines.\n\n";
5: #include petscda.h
6: #include petscsys.h
10: int main(int argc,char **argv)
11: {
12: int rank,M = 10,N = 8,m = PETSC_DECIDE,ierr;
13: int s=2,w=2,n = PETSC_DECIDE,nloc,l,i,j,kk;
14: int Xs,Xm,Ys,Ym,iloc,*iglobal,*ltog;
15: int *lx = PETSC_NULL,*ly = PETSC_NULL;
16: PetscTruth testorder,flg;
17: DAPeriodicType wrap = DA_NONPERIODIC;
18: DA da;
19: PetscViewer viewer;
20: Vec local,global;
21: PetscScalar value;
22: DAStencilType st = DA_STENCIL_BOX;
23: AO ao;
24:
25: PetscInitialize(&argc,&argv,(char*)0,help);
26: PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,400,400,&viewer);
27:
28: /* Readoptions */
29: PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
30: PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
31: PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
32: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
33: PetscOptionsGetInt(PETSC_NULL,"-s",&s,PETSC_NULL);
34: PetscOptionsGetInt(PETSC_NULL,"-w",&w,PETSC_NULL);
35: PetscOptionsHasName(PETSC_NULL,"-xwrap",&flg); if (flg) wrap = DA_XPERIODIC;
36: PetscOptionsHasName(PETSC_NULL,"-ywrap",&flg); if (flg) wrap = DA_YPERIODIC;
37: PetscOptionsHasName(PETSC_NULL,"-xywrap",&flg); if (flg) wrap = DA_XYPERIODIC;
38: PetscOptionsHasName(PETSC_NULL,"-star",&flg); if (flg) st = DA_STENCIL_STAR;
39: PetscOptionsHasName(PETSC_NULL,"-testorder",&testorder);
40: /*
41: Test putting two nodes in x and y on each processor, exact last processor
42: in x and y gets the rest.
43: */
44: PetscOptionsHasName(PETSC_NULL,"-distribute",&flg);
45: if (flg) {
46: if (m == PETSC_DECIDE) SETERRQ(1,"Must set -m option with -distribute option");
47: PetscMalloc(m*sizeof(int),&lx);
48: for (i=0; i<m-1; i++) { lx[i] = 4;}
49: lx[m-1] = M - 4*(m-1);
50: if (n == PETSC_DECIDE) SETERRQ(1,"Must set -n option with -distribute option");
51: PetscMalloc(n*sizeof(int),&ly);
52: for (i=0; i<n-1; i++) { ly[i] = 2;}
53: ly[n-1] = N - 2*(n-1);
54: }
57: /* Create distributed array and get vectors */
58: DACreate2d(PETSC_COMM_WORLD,wrap,st,M,N,m,n,w,s,lx,ly,&da);
59: if (lx) {
60: PetscFree(lx);
61: PetscFree(ly);
62: }
64: DAView(da,viewer);
65: DACreateGlobalVector(da,&global);
66: DACreateLocalVector(da,&local);
68: /* Set global vector; send ghost points to local vectors */
69: value = 1;
70: VecSet(&value,global);
71: DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
72: DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);
74: /* Scale local vectors according to processor rank; pass to global vector */
75: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
76: value = rank;
77: VecScale(&value,local);
78: DALocalToGlobal(da,local,INSERT_VALUES,global);
80: if (!testorder) { /* turn off printing when testing ordering mappings */
81: PetscPrintf (PETSC_COMM_WORLD,"\nGlobal Vectors:\n");
82: PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_NATIVE);
83: VecView(global,PETSC_VIEWER_STDOUT_WORLD);
84: PetscPrintf (PETSC_COMM_WORLD,"\n\n");
85: }
87: /* Send ghost points to local vectors */
88: DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
89: DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);
91: PetscOptionsHasName(PETSC_NULL,"-local_print",&flg);
92: if (flg) {
93: PetscViewer sviewer;
94: PetscSynchronizedPrintf(PETSC_COMM_WORLD,"\nLocal Vector: processor %d\n",rank);
95: PetscViewerGetSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
96: VecView(local,sviewer);
97: PetscViewerRestoreSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
98: }
100: /* Tests mappings betweeen application/PETSc orderings */
101: if (testorder) {
102: DAGetGhostCorners(da,&Xs,&Ys,PETSC_NULL,&Xm,&Ym,PETSC_NULL);
103: DAGetGlobalIndices(da,&nloc,<og);
104: DAGetAO(da,&ao);
105: PetscMalloc(nloc*sizeof(int),&iglobal);
107: /* Set iglobal to be global indices for each processor's local and ghost nodes,
108: using the DA ordering of grid points */
109: kk = 0;
110: for (j=Ys; j<Ys+Ym; j++) {
111: for (i=Xs; i<Xs+Xm; i++) {
112: iloc = w*((j-Ys)*Xm + i-Xs);
113: for (l=0; l<w; l++) {
114: iglobal[kk++] = ltog[iloc+l];
115: }
116: }
117: }
119: /* Map this to the application ordering (which for DAs is just the natural ordering
120: that would be used for 1 processor, numbering most rapidly by x, then y) */
121: AOPetscToApplication(ao,nloc,iglobal);
123: /* Then map the application ordering back to the PETSc DA ordering */
124: AOApplicationToPetsc(ao,nloc,iglobal);
126: /* Verify the mappings */
127: kk=0;
128: for (j=Ys; j<Ys+Ym; j++) {
129: for (i=Xs; i<Xs+Xm; i++) {
130: iloc = w*((j-Ys)*Xm + i-Xs);
131: for (l=0; l<w; l++) {
132: if (iglobal[kk] != ltog[iloc+l]) {fprintf(stdout,
133: "[%d] Problem with mapping: j=%d, i=%d, l=%d, petsc1=%d, petsc2=%d\n",
134: rank,j,i,l,ltog[iloc+l],iglobal[kk]);}
135: kk++;
136: }
137: }
138: }
139: PetscFree(iglobal);
140: }
142: /* Free memory */
143: PetscViewerDestroy(viewer);
144: VecDestroy(local);
145: VecDestroy(global);
146: DADestroy(da);
148: PetscFinalize();
149: return 0;
150: }