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 14c4762a1bSJed Brown int main(int argc,char **args) 15c4762a1bSJed Brown { 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 24*327415f7SBarry 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; 42c4762a1bSJed Brown for (row = rstart; row < rend; row++) 43c4762a1bSJed Brown { 44c4762a1bSJed Brown ia[i] = ia[i-1]; 45c4762a1bSJed Brown 46c4762a1bSJed Brown /* diagonal */ 47c4762a1bSJed Brown col = row; 48c4762a1bSJed Brown { 49c4762a1bSJed Brown ja[ia[i]] = col; 50c4762a1bSJed Brown ia[i]++; 51c4762a1bSJed Brown } 52c4762a1bSJed Brown 53c4762a1bSJed Brown /* lower diagonal */ 54c4762a1bSJed Brown col = row-1; 55c4762a1bSJed Brown if (col >= 0) 56c4762a1bSJed Brown { 57c4762a1bSJed Brown ja[ia[i]] = col; 58c4762a1bSJed Brown ia[i]++; 59c4762a1bSJed Brown } 60c4762a1bSJed Brown 61c4762a1bSJed Brown /* upper diagonal */ 62c4762a1bSJed Brown col = row+1; 63c4762a1bSJed Brown if (col < N) 64c4762a1bSJed Brown { 65c4762a1bSJed Brown ja[ia[i]] = col; 66c4762a1bSJed Brown ia[i]++; 67c4762a1bSJed Brown } 68c4762a1bSJed Brown i++; 69c4762a1bSJed Brown } 70c4762a1bSJed Brown 719566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 729566063dSJacob Faibussowitsch PetscCall(MatSetSizes(A, n, n, PETSC_DETERMINE, PETSC_DETERMINE)); 739566063dSJacob Faibussowitsch PetscCall(MatSetType(A,MATMPIAIJ)); 749566063dSJacob Faibussowitsch PetscCall(MatMPIAIJSetPreallocationCSR(A, ia, ja, NULL)); 759566063dSJacob Faibussowitsch PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD)); 769566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 77c4762a1bSJed Brown 789566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 799566063dSJacob Faibussowitsch PetscCall(MatSetSizes(A, bs*n, bs*n, PETSC_DETERMINE, PETSC_DETERMINE)); 809566063dSJacob Faibussowitsch PetscCall(MatSetType(A,MATMPIBAIJ)); 819566063dSJacob Faibussowitsch PetscCall(MatMPIBAIJSetPreallocationCSR(A, bs, ia, ja, NULL)); 829566063dSJacob Faibussowitsch PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD)); 839566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 84c4762a1bSJed Brown 859566063dSJacob Faibussowitsch PetscCall(PetscFree(ia)); 869566063dSJacob Faibussowitsch PetscCall(PetscFree(ja)); 879566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 88b122ec5aSJacob Faibussowitsch return 0; 89c4762a1bSJed Brown } 90c4762a1bSJed Brown 91c4762a1bSJed Brown /*TEST 92c4762a1bSJed Brown 93c4762a1bSJed Brown test: 94c4762a1bSJed Brown nsize: 4 95c4762a1bSJed Brown 96c4762a1bSJed Brown TEST*/ 97