Actual source code: ex40.c
1: /*$Id: ex40.c,v 1.25 2001/08/07 03:03:07 balay Exp $*/
3: static char help[] = "Tests the parallel case for MatIncreaseOverlap(). Input arguments are:n
4: -f <input_file> : file to load. For a 5X5 example of the 5-pt. stencil,n
5: use the file petsc/src/mat/examples/matbinary.exn
6: -nd <size> : > 0 number of domains per processor n
7: -ov <overlap> : >=0 amount of overlap between domainsnn";
9: #include petscsles.h
11: int main(int argc,char **args)
12: {
13: int ierr,nd = 2,ov=1,i,size,start,m,n,end,rank;
14: PetscTruth flg;
15: Mat A,B;
16: char file[128];
17: PetscViewer fd;
18: IS *is1,*is2;
19: PetscRandom r;
20: PetscScalar rand;
22: PetscInitialize(&argc,&args,(char *)0,help);
23: #if defined(PETSC_USE_COMPLEX)
24: SETERRQ(1,"This example does not work with complex numbers");
25: #else
26:
27: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
28: PetscOptionsGetString(PETSC_NULL,"-f",file,127,PETSC_NULL);
29: PetscOptionsGetInt(PETSC_NULL,"-nd",&nd,PETSC_NULL);
30: PetscOptionsGetInt(PETSC_NULL,"-ov",&ov,PETSC_NULL);
32: /* Read matrix and RHS */
33: PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,PETSC_BINARY_RDONLY,&fd);
34: MatLoad(fd,MATMPIAIJ,&A);
35: PetscViewerDestroy(fd);
37: /* Read the matrix again as a sequential matrix */
38: PetscViewerBinaryOpen(PETSC_COMM_SELF,file,PETSC_BINARY_RDONLY,&fd);
39: MatLoad(fd,MATSEQAIJ,&B);
40: PetscViewerDestroy(fd);
41:
42: /* Create the IS corresponding to subdomains */
43: PetscMalloc(nd*sizeof(IS **),&is1);
44: PetscMalloc(nd*sizeof(IS **),&is2);
46: /* Create the random Index Sets */
47: MatGetSize(A,&m,&n);
48: PetscRandomCreate(PETSC_COMM_SELF,RANDOM_DEFAULT,&r);
49: for (i=0; i<nd; i++) {
50: PetscRandomGetValue(r,&rand);
51: start = (int)(rand*m);
52: PetscRandomGetValue(r,&rand);
53: end = (int)(rand*m);
54: size = end - start;
55: if (start > end) { start = end; size = -size ;}
56: ISCreateStride(PETSC_COMM_SELF,size,start,1,is1+i);
57: ISCreateStride(PETSC_COMM_SELF,size,start,1,is2+i);
58: }
59: MatIncreaseOverlap(A,nd,is1,ov);
60: MatIncreaseOverlap(B,nd,is2,ov);
62: /* Now see if the serial and parallel case have the same answers */
63: for (i=0; i<nd; ++i) {
64: ISEqual(is1[i],is2[i],&flg);
65: PetscPrintf(PETSC_COMM_SELF,"proc:[%d], i=%d, flg =%dn",rank,i,flg);
66: }
68: /* Free allocated memory */
69: for (i=0; i<nd; ++i) {
70: ISDestroy(is1[i]);
71: ISDestroy(is2[i]);
72: }
73: PetscFree(is1);
74: PetscFree(is2);
75: PetscRandomDestroy(r);
76: MatDestroy(A);
77: MatDestroy(B);
79: PetscFinalize();
80: #endif
81: return 0;
82: }