2: static char help[] = "Tests MatIncreaseOverlap() and MatCreateSubmatrices() for the parallel case.\n\
  3: This example is similar to ex40.c; here the index sets used are random.\n\
  4: Input arguments are:\n\
  5:   -f <input_file> : file to load.  For example see $PETSC_DIR/share/petsc/datafiles/matrices\n\
  6:   -nd <size>      : > 0  no of domains per processor \n\
  7:   -ov <overlap>   : >=0  amount of overlap between domains\n\n";

  9:  #include <petscmat.h>

 11: int main(int argc,char **args)
 12: {
 14:   PetscInt       nd = 2,ov=1,i,j,lsize,m,n,*idx,bs;
 15:   PetscMPIInt    rank, size;
 16:   PetscBool      flg;
 17:   Mat            A,B,*submatA,*submatB;
 18:   char           file[PETSC_MAX_PATH_LEN];
 19:   PetscViewer    fd;
 20:   IS             *is1,*is2;
 21:   PetscRandom    r;
 22:   PetscBool      test_unsorted = PETSC_FALSE;
 23:   PetscScalar    rand;

 25:   PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;
 26:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 27:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 28:   PetscOptionsGetString(NULL,NULL,"-f",file,PETSC_MAX_PATH_LEN,NULL);
 29:   PetscOptionsGetInt(NULL,NULL,"-nd",&nd,NULL);
 30:   PetscOptionsGetInt(NULL,NULL,"-ov",&ov,NULL);
 31:   PetscOptionsGetBool(NULL,NULL,"-test_unsorted",&test_unsorted,NULL);

 33:   /* Read matrix A and RHS */
 34:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&fd);
 35:   MatCreate(PETSC_COMM_WORLD,&A);
 36:   MatSetType(A,MATAIJ);
 37:   MatSetFromOptions(A);
 38:   MatLoad(A,fd);
 39:   PetscViewerDestroy(&fd);

 41:   /* Read the same matrix as a seq matrix B */
 42:   PetscViewerBinaryOpen(PETSC_COMM_SELF,file,FILE_MODE_READ,&fd);
 43:   MatCreate(PETSC_COMM_SELF,&B);
 44:   MatSetType(B,MATSEQAIJ);
 45:   MatSetFromOptions(B);
 46:   MatLoad(B,fd);
 47:   PetscViewerDestroy(&fd);

 49:   MatGetBlockSize(A,&bs);

 51:   /* Create the Random no generator */
 52:   MatGetSize(A,&m,&n);
 53:   PetscRandomCreate(PETSC_COMM_SELF,&r);
 54:   PetscRandomSetFromOptions(r);

 56:   /* Create the IS corresponding to subdomains */
 57:   PetscMalloc1(nd,&is1);
 58:   PetscMalloc1(nd,&is2);
 59:   PetscMalloc1(m ,&idx);
 60:   for (i = 0; i < m; i++) {idx[i] = i;}

 62:   /* Create the random Index Sets */
 63:   for (i=0; i<nd; i++) {
 64:     /* Skip a few,so that the IS on different procs are diffeent*/
 65:     for (j=0; j<rank; j++) {
 66:       PetscRandomGetValue(r,&rand);
 67:     }
 68:     PetscRandomGetValue(r,&rand);
 69:     lsize = (PetscInt)(rand*(m/bs));
 70:     /* shuffle */
 71:     for (j=0; j<lsize; j++) {
 72:       PetscInt k, swap, l;

 74:       PetscRandomGetValue(r,&rand);
 75:       k      = j + (PetscInt)(rand*((m/bs)-j));
 76:       for (l = 0; l < bs; l++) {
 77:         swap        = idx[bs*j+l];
 78:         idx[bs*j+l] = idx[bs*k+l];
 79:         idx[bs*k+l] = swap;
 80:       }
 81:     }
 82:     if (!test_unsorted) {PetscSortInt(lsize*bs,idx);}
 83:     ISCreateGeneral(PETSC_COMM_SELF,lsize*bs,idx,PETSC_COPY_VALUES,is1+i);
 84:     ISCreateGeneral(PETSC_COMM_SELF,lsize*bs,idx,PETSC_COPY_VALUES,is2+i);
 85:     ISSetBlockSize(is1[i],bs);
 86:     ISSetBlockSize(is2[i],bs);
 87:   }

 89:   if (!test_unsorted) {
 90:     MatIncreaseOverlap(A,nd,is1,ov);
 91:     MatIncreaseOverlap(B,nd,is2,ov);

 93:     for (i=0; i<nd; ++i) {
 94:       ISSort(is1[i]);
 95:       ISSort(is2[i]);
 96:     }
 97:   }

 99:   MatCreateSubMatrices(A,nd,is1,is1,MAT_INITIAL_MATRIX,&submatA);
100:   MatCreateSubMatrices(B,nd,is2,is2,MAT_INITIAL_MATRIX,&submatB);

102:   /* Now see if the serial and parallel case have the same answers */
103:   for (i=0; i<nd; ++i) {
104:     MatEqual(submatA[i],submatB[i],&flg);
105:     if (!flg) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_PLIB,"%D-th paralle submatA != seq submatB",i);
106:   }

108:   /* Free Allocated Memory */
109:   for (i=0; i<nd; ++i) {
110:     ISDestroy(&is1[i]);
111:     ISDestroy(&is2[i]);
112:   }
113:   MatDestroySubMatrices(nd,&submatA);
114:   MatDestroySubMatrices(nd,&submatB);

116:   PetscRandomDestroy(&r);
117:   PetscFree(is1);
118:   PetscFree(is2);
119:   MatDestroy(&A);
120:   MatDestroy(&B);
121:   PetscFree(idx);
122:   PetscFinalize();
123:   return ierr;
124: }



128: /*TEST

130:    build:
131:       requires: !complex

133:    test:
134:       nsize: 3
135:       requires: datafilespath double !define(PETSC_USE_64BIT_INDICES) !complex
136:       args: -f ${DATAFILESPATH}/matrices/arco1 -nd 5 -ov 2

138:    test:
139:       suffix: 2
140:       args: -f ${DATAFILESPATH}/matrices/arco1 -nd 8 -ov 2
141:       requires: datafilespath double !define(PETSC_USE_64BIT_INDICES) !complex

143:    test:
144:       suffix: unsorted_baij_mpi
145:       nsize: 3
146:       requires: datafilespath double !define(PETSC_USE_64BIT_INDICES) !complex
147:       args: -f ${DATAFILESPATH}/matrices/cfd.1.10 -nd 8 -mat_type baij -test_unsorted

149:    test:
150:       suffix: unsorted_baij_seq
151:       requires: datafilespath double !define(PETSC_USE_64BIT_INDICES) !complex
152:       args: -f ${DATAFILESPATH}/matrices/cfd.1.10 -nd 8 -mat_type baij -test_unsorted

154:    test:
155:       suffix: unsorted_mpi
156:       nsize: 3
157:       requires: datafilespath double !define(PETSC_USE_64BIT_INDICES) !complex
158:       args: -f ${DATAFILESPATH}/matrices/arco1 -nd 8 -test_unsorted

160:    test:
161:       suffix: unsorted_seq
162:       requires: datafilespath double !define(PETSC_USE_64BIT_INDICES) !complex
163:       args: -f ${DATAFILESPATH}/matrices/arco1 -nd 8 -test_unsorted

165: TEST*/