1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests MatMPIBAIJSetPreallocationCSR()\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown /* 5c4762a1bSJed Brown Include "petscmat.h" so that we can use matrices. Note that this file 6c4762a1bSJed Brown automatically includes: 7c4762a1bSJed Brown petscsys.h - base PETSc routines petscvec.h - vectors 8c4762a1bSJed Brown petscmat.h - matrices 9c4762a1bSJed Brown petscis.h - index sets 10c4762a1bSJed Brown petscviewer.h - viewers 11c4762a1bSJed Brown */ 12c4762a1bSJed Brown #include <petscmat.h> 13c4762a1bSJed Brown 14*d71ae5a4SJacob Faibussowitsch int main(int argc, char **args) 15*d71ae5a4SJacob Faibussowitsch { 16c4762a1bSJed Brown Mat A; 17c4762a1bSJed Brown PetscInt *ia, *ja, bs = 2; 18c4762a1bSJed Brown PetscInt N = 9, n; 19c4762a1bSJed Brown PetscInt rstart, rend, row, col; 20c4762a1bSJed Brown PetscInt i; 21c4762a1bSJed Brown PetscMPIInt rank, size; 22c4762a1bSJed Brown Vec v; 23c4762a1bSJed Brown 24327415f7SBarry Smith PetscFunctionBeginUser; 259566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 269566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 27be096a46SBarry Smith PetscCheck(size < 5, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "Can only use at most 4 processors."); 289566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 29c4762a1bSJed Brown 30c4762a1bSJed Brown /* Get a partition range based on the vector size */ 319566063dSJacob Faibussowitsch PetscCall(VecCreateMPI(PETSC_COMM_WORLD, PETSC_DECIDE, N, &v)); 329566063dSJacob Faibussowitsch PetscCall(VecGetLocalSize(v, &n)); 339566063dSJacob Faibussowitsch PetscCall(VecGetOwnershipRange(v, &rstart, &rend)); 349566063dSJacob Faibussowitsch PetscCall(VecDestroy(&v)); 35c4762a1bSJed Brown 369566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(n + 1, &ia)); 379566063dSJacob Faibussowitsch PetscCall(PetscMalloc1(3 * n, &ja)); 38c4762a1bSJed Brown 39c4762a1bSJed Brown /* Construct a tri-diagonal CSR indexing */ 40c4762a1bSJed Brown i = 1; 41c4762a1bSJed Brown ia[0] = 0; 429371c9d4SSatish Balay for (row = rstart; row < rend; row++) { 43c4762a1bSJed Brown ia[i] = ia[i - 1]; 44c4762a1bSJed Brown 45c4762a1bSJed Brown /* diagonal */ 46c4762a1bSJed Brown col = row; 47c4762a1bSJed Brown { 48c4762a1bSJed Brown ja[ia[i]] = col; 49c4762a1bSJed Brown ia[i]++; 50c4762a1bSJed Brown } 51c4762a1bSJed Brown 52c4762a1bSJed Brown /* lower diagonal */ 53c4762a1bSJed Brown col = row - 1; 549371c9d4SSatish Balay if (col >= 0) { 55c4762a1bSJed Brown ja[ia[i]] = col; 56c4762a1bSJed Brown ia[i]++; 57c4762a1bSJed Brown } 58c4762a1bSJed Brown 59c4762a1bSJed Brown /* upper diagonal */ 60c4762a1bSJed Brown col = row + 1; 619371c9d4SSatish Balay if (col < N) { 62c4762a1bSJed Brown ja[ia[i]] = col; 63c4762a1bSJed Brown ia[i]++; 64c4762a1bSJed Brown } 65c4762a1bSJed Brown i++; 66c4762a1bSJed Brown } 67c4762a1bSJed Brown 689566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 699566063dSJacob Faibussowitsch PetscCall(MatSetSizes(A, n, n, PETSC_DETERMINE, PETSC_DETERMINE)); 709566063dSJacob Faibussowitsch PetscCall(MatSetType(A, MATMPIAIJ)); 719566063dSJacob Faibussowitsch PetscCall(MatMPIAIJSetPreallocationCSR(A, ia, ja, NULL)); 729566063dSJacob Faibussowitsch PetscCall(MatView(A, PETSC_VIEWER_STDOUT_WORLD)); 739566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 74c4762a1bSJed Brown 759566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 769566063dSJacob Faibussowitsch PetscCall(MatSetSizes(A, bs * n, bs * n, PETSC_DETERMINE, PETSC_DETERMINE)); 779566063dSJacob Faibussowitsch PetscCall(MatSetType(A, MATMPIBAIJ)); 789566063dSJacob Faibussowitsch PetscCall(MatMPIBAIJSetPreallocationCSR(A, bs, ia, ja, NULL)); 799566063dSJacob Faibussowitsch PetscCall(MatView(A, PETSC_VIEWER_STDOUT_WORLD)); 809566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 81c4762a1bSJed Brown 829566063dSJacob Faibussowitsch PetscCall(PetscFree(ia)); 839566063dSJacob Faibussowitsch PetscCall(PetscFree(ja)); 849566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 85b122ec5aSJacob Faibussowitsch return 0; 86c4762a1bSJed Brown } 87c4762a1bSJed Brown 88c4762a1bSJed Brown /*TEST 89c4762a1bSJed Brown 90c4762a1bSJed Brown test: 91c4762a1bSJed Brown nsize: 4 92c4762a1bSJed Brown 93c4762a1bSJed Brown TEST*/ 94