Actual source code: ex41.c
1: /*$Id: ex41.c,v 1.25 2001/08/07 03:03:07 balay Exp $*/
3: static char help[] = "Tests MatIncreaseOverlap() - the parallel case. This example\n\
4: is similar to ex40.c; here the index sets used are random. Input arguments are:\n\
5: -f <input_file> : file to load. For a 5X5 example of the 5-pt. stencil,\n\
6: use the file petsc/src/mat/examples/matbinary.ex\n\
7: -nd <size> : > 0 no of domains per processor \n\
8: -ov <overlap> : >=0 amount of overlap between domains\n\n";
10: #include petscsles.h
14: int main(int argc,char **args)
15: {
16: int ierr,nd = 2,ov=1,i,j,size,m,n,rank,*idx;
17: PetscTruth flg;
18: Mat A,B;
19: char file[128];
20: PetscViewer fd;
21: IS *is1,*is2;
22: PetscRandom r;
23: PetscScalar rand;
25: PetscInitialize(&argc,&args,(char *)0,help);
26: #if defined(PETSC_USE_COMPLEX)
27: SETERRQ(1,"This example does not work with complex numbers");
28: #else
29:
30: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
31: PetscOptionsGetString(PETSC_NULL,"-f",file,127,PETSC_NULL);
32: PetscOptionsGetInt(PETSC_NULL,"-nd",&nd,PETSC_NULL);
33: PetscOptionsGetInt(PETSC_NULL,"-ov",&ov,PETSC_NULL);
35: /* Read matrix and RHS */
36: PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,PETSC_BINARY_RDONLY,&fd);
37: MatLoad(fd,MATMPIAIJ,&A);
38: PetscViewerDestroy(fd);
40: /* Read the matrix again as a seq matrix */
41: PetscViewerBinaryOpen(PETSC_COMM_SELF,file,PETSC_BINARY_RDONLY,&fd);
42: MatLoad(fd,MATSEQAIJ,&B);
43: PetscViewerDestroy(fd);
44:
45: /* Create the Random no generator */
46: MatGetSize(A,&m,&n);
47: PetscRandomCreate(PETSC_COMM_SELF,RANDOM_DEFAULT,&r);
48:
49: /* Create the IS corresponding to subdomains */
50: PetscMalloc(nd*sizeof(IS **),&is1);
51: PetscMalloc(nd*sizeof(IS **),&is2);
52: PetscMalloc(m *sizeof(int),&idx);
54: /* Create the random Index Sets */
55: for (i=0; i<nd; i++) {
56: for (j=0; j<rank; j++) {
57: PetscRandomGetValue(r,&rand);
58: }
59: PetscRandomGetValue(r,&rand);
60: size = (int)(rand*m);
61: for (j=0; j<size; j++) {
62: PetscRandomGetValue(r,&rand);
63: idx[j] = (int)(rand*m);
64: }
65: ISCreateGeneral(PETSC_COMM_SELF,size,idx,is1+i);
66: ISCreateGeneral(PETSC_COMM_SELF,size,idx,is2+i);
67: }
68:
69: MatIncreaseOverlap(A,nd,is1,ov);
70: MatIncreaseOverlap(B,nd,is2,ov);
71:
72: /* Now see if the serial and parallel case have the same answers */
73: for (i=0; i<nd; ++i) {
74: int sz1,sz2;
75: ISEqual(is1[i],is2[i],&flg);
76: ISGetSize(is1[i],&sz1);
77: ISGetSize(is2[i],&sz2);
78: PetscPrintf(PETSC_COMM_SELF,"proc:[%d], i=%d, flg =%d sz1 = %d sz2 = %d\n",rank,i,flg,sz1,sz2);
79: /* ISView(is1[i],PETSC_VIEWER_STDOUT_SELF);
80: ISView(is2[i],PETSC_VIEWER_STDOUT_SELF); */
81: }
83: /* Free Allocated Memory */
84: for (i=0; i<nd; ++i) {
85: ISDestroy(is1[i]);
86: ISDestroy(is2[i]);
87: }
88: PetscRandomDestroy(r);
89: PetscFree(is1);
90: PetscFree(is2);
91: MatDestroy(A);
92: MatDestroy(B);
93: PetscFree(idx);
95: PetscFinalize();
96: #endif
97: return 0;
98: }