1 2 static char help[] = "Tests the use of MatZeroRows() for parallel matrices.\n\ 3 This example also tests the use of MatDuplicate() for both MPIAIJ and MPIBAIJ matrices"; 4 5 #include <petscmat.h> 6 7 extern PetscErrorCode TestMatZeroRows_Basic(Mat, IS, PetscScalar); 8 extern PetscErrorCode TestMatZeroRows_with_no_allocation(Mat, IS, PetscScalar); 9 10 int main(int argc, char **args) { 11 Mat A; 12 PetscInt i, j, m = 3, n, Ii, J, Imax; 13 PetscMPIInt rank, size; 14 PetscScalar v, diag = -4.0; 15 IS is; 16 17 PetscFunctionBeginUser; 18 PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 19 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 20 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 21 n = 2 * size; 22 23 /* create A Square matrix for the five point stencil,YET AGAIN*/ 24 PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 25 PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n)); 26 PetscCall(MatSetFromOptions(A)); 27 PetscCall(MatSetUp(A)); 28 for (i = 0; i < m; i++) { 29 for (j = 2 * rank; j < 2 * rank + 2; j++) { 30 v = -1.0; 31 Ii = j + n * i; 32 if (i > 0) { 33 J = Ii - n; 34 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 35 } 36 if (i < m - 1) { 37 J = Ii + n; 38 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 39 } 40 if (j > 0) { 41 J = Ii - 1; 42 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 43 } 44 if (j < n - 1) { 45 J = Ii + 1; 46 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 47 } 48 v = 4.0; 49 PetscCall(MatSetValues(A, 1, &Ii, 1, &Ii, &v, INSERT_VALUES)); 50 } 51 } 52 PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 53 PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 54 55 /* Create AN IS required by MatZeroRows() */ 56 Imax = n * rank; 57 if (Imax >= n * m - m - 1) Imax = m * n - m - 1; 58 PetscCall(ISCreateStride(PETSC_COMM_SELF, m, Imax, 1, &is)); 59 60 PetscCall(TestMatZeroRows_Basic(A, is, 0.0)); 61 PetscCall(TestMatZeroRows_Basic(A, is, diag)); 62 63 PetscCall(TestMatZeroRows_with_no_allocation(A, is, 0.0)); 64 PetscCall(TestMatZeroRows_with_no_allocation(A, is, diag)); 65 66 PetscCall(MatDestroy(&A)); 67 68 /* Now Create a rectangular matrix with five point stencil (app) 69 n+size is used so that this dimension is always divisible by size. 70 This way, we can always use bs = size for any number of procs */ 71 PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 72 PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, m * n, m * (n + size))); 73 PetscCall(MatSetFromOptions(A)); 74 PetscCall(MatSetUp(A)); 75 for (i = 0; i < m; i++) { 76 for (j = 2 * rank; j < 2 * rank + 2; j++) { 77 v = -1.0; 78 Ii = j + n * i; 79 if (i > 0) { 80 J = Ii - n; 81 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 82 } 83 if (i < m - 1) { 84 J = Ii + n; 85 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 86 } 87 if (j > 0) { 88 J = Ii - 1; 89 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 90 } 91 if (j < n + size - 1) { 92 J = Ii + 1; 93 PetscCall(MatSetValues(A, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 94 } 95 v = 4.0; 96 PetscCall(MatSetValues(A, 1, &Ii, 1, &Ii, &v, INSERT_VALUES)); 97 } 98 } 99 PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 100 PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 101 102 PetscCall(TestMatZeroRows_Basic(A, is, 0.0)); 103 PetscCall(TestMatZeroRows_Basic(A, is, diag)); 104 105 PetscCall(MatDestroy(&A)); 106 PetscCall(ISDestroy(&is)); 107 PetscCall(PetscFinalize()); 108 return 0; 109 } 110 111 PetscErrorCode TestMatZeroRows_Basic(Mat A, IS is, PetscScalar diag) { 112 Mat B; 113 PetscBool keepnonzeropattern; 114 115 /* Now copy A into B, and test it with MatZeroRows() */ 116 PetscCall(MatDuplicate(A, MAT_COPY_VALUES, &B)); 117 118 PetscCall(PetscOptionsHasName(NULL, NULL, "-keep_nonzero_pattern", &keepnonzeropattern)); 119 if (keepnonzeropattern) PetscCall(MatSetOption(B, MAT_KEEP_NONZERO_PATTERN, PETSC_TRUE)); 120 121 PetscCall(MatZeroRowsIS(B, is, diag, 0, 0)); 122 PetscCall(MatView(B, PETSC_VIEWER_STDOUT_WORLD)); 123 PetscCall(MatDestroy(&B)); 124 return 0; 125 } 126 127 PetscErrorCode TestMatZeroRows_with_no_allocation(Mat A, IS is, PetscScalar diag) { 128 Mat B; 129 130 /* Now copy A into B, and test it with MatZeroRows() */ 131 PetscCall(MatDuplicate(A, MAT_COPY_VALUES, &B)); 132 /* Set this flag after assembly. This way, it affects only MatZeroRows() */ 133 PetscCall(MatSetOption(B, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_TRUE)); 134 135 PetscCall(MatZeroRowsIS(B, is, diag, 0, 0)); 136 PetscCall(MatView(B, PETSC_VIEWER_STDOUT_WORLD)); 137 PetscCall(MatDestroy(&B)); 138 return 0; 139 } 140 141 /*TEST 142 143 test: 144 nsize: 2 145 filter: grep -v " MPI process" 146 147 test: 148 suffix: 2 149 nsize: 3 150 args: -mat_type mpibaij -mat_block_size 3 151 filter: grep -v " MPI process" 152 153 test: 154 suffix: 3 155 nsize: 3 156 args: -mat_type mpiaij -keep_nonzero_pattern 157 filter: grep -v " MPI process" 158 159 test: 160 suffix: 4 161 nsize: 3 162 args: -keep_nonzero_pattern -mat_type mpibaij -mat_block_size 3 163 filter: grep -v " MPI process" 164 165 TEST*/ 166