Actual source code: ex86.c
1: static char help[] = "Testing MatCreateMPIMatConcatenateSeqMat().\n\n";
3: #include <petscmat.h>
4: int main(int argc,char **argv)
5: {
6: Mat seqmat,mpimat;
7: PetscMPIInt rank;
8: PetscScalar value[3],*vals;
9: PetscInt i,col[3],n=5,bs=1;
11: PetscInitialize(&argc,&argv,(char*)0,help);
12: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
13: PetscOptionsGetInt(NULL,NULL,"-bs",&bs,NULL);
15: /* Create seqaij matrices of size (n+rank) by n */
16: MatCreate(PETSC_COMM_SELF,&seqmat);
17: MatSetSizes(seqmat,(n+rank)*bs,PETSC_DECIDE,PETSC_DECIDE,n*bs);
18: MatSetFromOptions(seqmat);
19: MatSeqAIJSetPreallocation(seqmat,3*bs,NULL);
20: MatSeqBAIJSetPreallocation(seqmat,bs,3,NULL);
22: if (bs == 1) {
23: value[0] = -1.0; value[1] = 2.0; value[2] = -1.0;
24: for (i=1; i<n-1; i++) {
25: col[0] = i-1; col[1] = i; col[2] = i+1;
26: MatSetValues(seqmat,1,&i,3,col,value,INSERT_VALUES);
27: }
28: i = n - 1; col[0] = n - 2; col[1] = n - 1;
29: MatSetValues(seqmat,1,&i,2,col,value,INSERT_VALUES);
31: i = 0; col[0] = 0; col[1] = 1; value[0] = 2.0; value[1] = -1.0;
32: MatSetValues(seqmat,1,&i,2,col,value,INSERT_VALUES);
33: } else {
34: PetscInt *rows,*cols,j;
35: PetscMalloc3(bs*bs,&vals,bs,&rows,bs,&cols);
36: /* diagonal blocks */
37: for (i=0; i<bs*bs; i++) vals[i] = 2.0;
38: for (i=0; i<n*bs; i+=bs) {
39: for (j=0; j<bs; j++) {rows[j] = i+j; cols[j] = i+j;}
40: MatSetValues(seqmat,bs,rows,bs,cols,vals,INSERT_VALUES);
41: }
42: /* off-diagonal blocks */
43: for (i=0; i<bs*bs; i++) vals[i] = -1.0;
44: for (i=0; i<(n-1)*bs; i+=bs) {
45: for (j=0; j<bs; j++) {rows[j] = i+j; cols[j] = i+bs+j;}
46: MatSetValues(seqmat,bs,rows,bs,cols,vals,INSERT_VALUES);
47: }
49: PetscFree3(vals,rows,cols);
50: }
51: MatAssemblyBegin(seqmat,MAT_FINAL_ASSEMBLY);
52: MatAssemblyEnd(seqmat,MAT_FINAL_ASSEMBLY);
53: if (rank == 0) {
54: PetscPrintf(PETSC_COMM_SELF,"[%d] seqmat:\n",rank);
55: MatView(seqmat,PETSC_VIEWER_STDOUT_SELF);
56: }
58: MatCreateMPIMatConcatenateSeqMat(PETSC_COMM_WORLD,seqmat,PETSC_DECIDE,MAT_INITIAL_MATRIX,&mpimat);
59: MatCreateMPIMatConcatenateSeqMat(PETSC_COMM_WORLD,seqmat,PETSC_DECIDE,MAT_REUSE_MATRIX,&mpimat);
60: MatView(mpimat,PETSC_VIEWER_STDOUT_WORLD);
62: MatDestroy(&seqmat);
63: MatDestroy(&mpimat);
64: PetscFinalize();
65: return 0;
66: }
68: /*TEST
70: test:
71: nsize: 3
73: test:
74: suffix: 2
75: nsize: 3
76: args: -mat_type baij
78: test:
79: suffix: 3
80: nsize: 3
81: args: -mat_type baij -bs 2
83: TEST*/