Actual source code: ex139.c
2: const char help[] = "Test MatCreateLocalRef()\n\n";
4: #include <petscmat.h>
6: static PetscErrorCode GetLocalRef(Mat A,IS isrow,IS iscol,Mat *B)
7: {
8: IS istmp;
10: PetscPrintf(PETSC_COMM_WORLD,"Extracting LocalRef with isrow:\n");
11: ISOnComm(isrow,PETSC_COMM_WORLD,PETSC_COPY_VALUES,&istmp);
12: ISView(istmp,PETSC_VIEWER_STDOUT_WORLD);
13: ISDestroy(&istmp);
14: PetscPrintf(PETSC_COMM_WORLD,"Extracting LocalRef with iscol (only rank=0 shown):\n");
15: ISOnComm(iscol,PETSC_COMM_WORLD,PETSC_COPY_VALUES,&istmp);
16: ISView(istmp,PETSC_VIEWER_STDOUT_WORLD);
17: ISDestroy(&istmp);
19: MatCreateLocalRef(A,isrow,iscol,B);
20: return 0;
21: }
23: int main(int argc,char *argv[])
24: {
25: PetscErrorCode ierr;
26: MPI_Comm comm;
27: Mat J,B;
28: PetscInt i,j,k,l,rstart,rend,m,n,top_bs,row_bs,col_bs,nlocblocks,*idx,nrowblocks,ncolblocks,*ridx,*cidx,*icol,*irow;
29: PetscScalar *vals;
30: ISLocalToGlobalMapping brmap;
31: IS is0,is1;
32: PetscBool diag,blocked;
34: PetscInitialize(&argc,&argv,0,help);
35: comm = PETSC_COMM_WORLD;
37: PetscOptionsBegin(comm,NULL,"LocalRef Test Options",NULL);
38: {
39: top_bs = 2; row_bs = 2; col_bs = 2; diag = PETSC_FALSE; blocked = PETSC_FALSE;
40: PetscOptionsInt("-top_bs","Block size of top-level matrix",0,top_bs,&top_bs,NULL);
41: PetscOptionsInt("-row_bs","Block size of row map",0,row_bs,&row_bs,NULL);
42: PetscOptionsInt("-col_bs","Block size of col map",0,col_bs,&col_bs,NULL);
43: PetscOptionsBool("-diag","Extract a diagonal black",0,diag,&diag,NULL);
44: PetscOptionsBool("-blocked","Use block insertion",0,blocked,&blocked,NULL);
45: }
46: PetscOptionsEnd();
48: MatCreate(comm,&J);
49: MatSetSizes(J,6,6,PETSC_DETERMINE,PETSC_DETERMINE);
50: MatSetBlockSize(J,top_bs);
51: MatSetFromOptions(J);
52: MatSeqBAIJSetPreallocation(J,top_bs,PETSC_DECIDE,0);
53: MatMPIBAIJSetPreallocation(J,top_bs,PETSC_DECIDE,0,PETSC_DECIDE,0);
54: MatSetUp(J);
55: MatGetSize(J,&m,&n);
56: MatGetOwnershipRange(J,&rstart,&rend);
58: nlocblocks = (rend-rstart)/top_bs + 2;
59: PetscMalloc1(nlocblocks,&idx);
60: for (i=0; i<nlocblocks; i++) {
61: idx[i] = (rstart/top_bs + i - 1 + m/top_bs) % (m/top_bs);
62: }
63: ISLocalToGlobalMappingCreate(comm,top_bs,nlocblocks,idx,PETSC_OWN_POINTER,&brmap);
64: PetscPrintf(comm,"Block ISLocalToGlobalMapping:\n");
65: ISLocalToGlobalMappingView(brmap,PETSC_VIEWER_STDOUT_WORLD);
67: MatSetLocalToGlobalMapping(J,brmap,brmap);
68: ISLocalToGlobalMappingDestroy(&brmap);
70: /* Create index sets for local submatrix */
71: nrowblocks = (rend-rstart)/row_bs;
72: ncolblocks = (rend-rstart)/col_bs;
73: PetscMalloc2(nrowblocks,&ridx,ncolblocks,&cidx);
74: for (i=0; i<nrowblocks; i++) ridx[i] = i + ((i > nrowblocks/2) ^ !rstart);
75: for (i=0; i<ncolblocks; i++) cidx[i] = i + ((i < ncolblocks/2) ^ !!rstart);
76: ISCreateBlock(PETSC_COMM_SELF,row_bs,nrowblocks,ridx,PETSC_COPY_VALUES,&is0);
77: ISCreateBlock(PETSC_COMM_SELF,col_bs,ncolblocks,cidx,PETSC_COPY_VALUES,&is1);
78: PetscFree2(ridx,cidx);
80: if (diag) {
81: ISDestroy(&is1);
82: PetscObjectReference((PetscObject)is0);
83: is1 = is0;
84: ncolblocks = nrowblocks;
85: }
87: GetLocalRef(J,is0,is1,&B);
89: MatZeroEntries(J);
91: PetscMalloc3(row_bs,&irow,col_bs,&icol,row_bs*col_bs,&vals);
92: for (i=0; i<nrowblocks; i++) {
93: for (j=0; j<ncolblocks; j++) {
94: for (k=0; k<row_bs; k++) {
95: for (l=0; l<col_bs; l++) {
96: vals[k*col_bs+l] = i * 100000 + j * 1000 + k * 10 + l;
97: }
98: irow[k] = i*row_bs+k;
99: }
100: for (l=0; l<col_bs; l++) icol[l] = j*col_bs+l;
101: if (blocked) {
102: MatSetValuesBlockedLocal(B,1,&i,1,&j,vals,ADD_VALUES);
103: } else {
104: MatSetValuesLocal(B,row_bs,irow,col_bs,icol,vals,ADD_VALUES);
105: }
106: }
107: }
108: PetscFree3(irow,icol,vals);
110: MatAssemblyBegin(J,MAT_FINAL_ASSEMBLY);
111: MatAssemblyEnd(J,MAT_FINAL_ASSEMBLY);
113: MatView(J,PETSC_VIEWER_STDOUT_WORLD);
115: ISDestroy(&is0);
116: ISDestroy(&is1);
117: MatDestroy(&B);
118: MatDestroy(&J);
119: PetscFinalize();
120: return 0;
121: }
123: /*TEST
125: test:
126: nsize: 2
127: filter: grep -v "type: mpi"
128: args: -blocked {{0 1}} -mat_type {{aij baij}}
130: TEST*/