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