1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests MatMPIBAIJSetPreallocationCSR()\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown /*T 5c4762a1bSJed Brown Concepts: partitioning 6c4762a1bSJed Brown Processors: 4 7c4762a1bSJed Brown T*/ 8c4762a1bSJed Brown 9c4762a1bSJed Brown /* 10c4762a1bSJed Brown Include "petscmat.h" so that we can use matrices. Note that this file 11c4762a1bSJed Brown automatically includes: 12c4762a1bSJed Brown petscsys.h - base PETSc routines petscvec.h - vectors 13c4762a1bSJed Brown petscmat.h - matrices 14c4762a1bSJed Brown petscis.h - index sets 15c4762a1bSJed Brown petscviewer.h - viewers 16c4762a1bSJed Brown */ 17c4762a1bSJed Brown #include <petscmat.h> 18c4762a1bSJed Brown 19c4762a1bSJed Brown int main(int argc,char **args) 20c4762a1bSJed Brown { 21c4762a1bSJed Brown Mat A; 22c4762a1bSJed Brown PetscInt *ia,*ja, bs = 2; 23c4762a1bSJed Brown PetscInt N = 9, n; 24c4762a1bSJed Brown PetscInt rstart, rend, row, col; 25c4762a1bSJed Brown PetscInt i; 26c4762a1bSJed Brown PetscErrorCode ierr; 27c4762a1bSJed Brown PetscMPIInt rank,size; 28c4762a1bSJed Brown Vec v; 29c4762a1bSJed Brown 30c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 31ffc4695bSBarry Smith ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRMPI(ierr); 32*2c71b3e2SJacob Faibussowitsch PetscCheckFalse(size > 4,PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"Can only use at most 4 processors."); 33ffc4695bSBarry Smith ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRMPI(ierr); 34c4762a1bSJed Brown 35c4762a1bSJed Brown /* Get a partition range based on the vector size */ 36c4762a1bSJed Brown ierr = VecCreateMPI(PETSC_COMM_WORLD, PETSC_DECIDE, N, &v);CHKERRQ(ierr); 37c4762a1bSJed Brown ierr = VecGetLocalSize(v, &n);CHKERRQ(ierr); 38c4762a1bSJed Brown ierr = VecGetOwnershipRange(v, &rstart, &rend);CHKERRQ(ierr); 39c4762a1bSJed Brown ierr = VecDestroy(&v);CHKERRQ(ierr); 40c4762a1bSJed Brown 41c4762a1bSJed Brown ierr = PetscMalloc1(n+1,&ia);CHKERRQ(ierr); 42c4762a1bSJed Brown ierr = PetscMalloc1(3*n,&ja);CHKERRQ(ierr); 43c4762a1bSJed Brown 44c4762a1bSJed Brown /* Construct a tri-diagonal CSR indexing */ 45c4762a1bSJed Brown i = 1; 46c4762a1bSJed Brown ia[0] = 0; 47c4762a1bSJed Brown for (row = rstart; row < rend; row++) 48c4762a1bSJed Brown { 49c4762a1bSJed Brown ia[i] = ia[i-1]; 50c4762a1bSJed Brown 51c4762a1bSJed Brown /* diagonal */ 52c4762a1bSJed Brown col = row; 53c4762a1bSJed Brown { 54c4762a1bSJed Brown ja[ia[i]] = col; 55c4762a1bSJed Brown ia[i]++; 56c4762a1bSJed Brown } 57c4762a1bSJed Brown 58c4762a1bSJed Brown /* lower diagonal */ 59c4762a1bSJed Brown col = row-1; 60c4762a1bSJed Brown if (col >= 0) 61c4762a1bSJed Brown { 62c4762a1bSJed Brown ja[ia[i]] = col; 63c4762a1bSJed Brown ia[i]++; 64c4762a1bSJed Brown } 65c4762a1bSJed Brown 66c4762a1bSJed Brown /* upper diagonal */ 67c4762a1bSJed Brown col = row+1; 68c4762a1bSJed Brown if (col < N) 69c4762a1bSJed Brown { 70c4762a1bSJed Brown ja[ia[i]] = col; 71c4762a1bSJed Brown ia[i]++; 72c4762a1bSJed Brown } 73c4762a1bSJed Brown i++; 74c4762a1bSJed Brown } 75c4762a1bSJed Brown 76c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_WORLD, &A);CHKERRQ(ierr); 77c4762a1bSJed Brown ierr = MatSetSizes(A, n, n, PETSC_DETERMINE, PETSC_DETERMINE);CHKERRQ(ierr); 78c4762a1bSJed Brown ierr = MatSetType(A,MATMPIAIJ);CHKERRQ(ierr); 79c4762a1bSJed Brown ierr = MatMPIAIJSetPreallocationCSR(A, ia, ja, NULL);CHKERRQ(ierr); 80c4762a1bSJed Brown ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 81c4762a1bSJed Brown ierr = MatDestroy(&A);CHKERRQ(ierr); 82c4762a1bSJed Brown 83c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_WORLD, &A);CHKERRQ(ierr); 84c4762a1bSJed Brown ierr = MatSetSizes(A, bs*n, bs*n, PETSC_DETERMINE, PETSC_DETERMINE);CHKERRQ(ierr); 85c4762a1bSJed Brown ierr = MatSetType(A,MATMPIBAIJ);CHKERRQ(ierr); 86c4762a1bSJed Brown ierr = MatMPIBAIJSetPreallocationCSR(A, bs, ia, ja, NULL);CHKERRQ(ierr); 87c4762a1bSJed Brown ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 88c4762a1bSJed Brown ierr = MatDestroy(&A);CHKERRQ(ierr); 89c4762a1bSJed Brown 90c4762a1bSJed Brown ierr = PetscFree(ia);CHKERRQ(ierr); 91c4762a1bSJed Brown ierr = PetscFree(ja);CHKERRQ(ierr); 92c4762a1bSJed Brown ierr = PetscFinalize(); 93c4762a1bSJed Brown return ierr; 94c4762a1bSJed Brown } 95c4762a1bSJed Brown 96c4762a1bSJed Brown /*TEST 97c4762a1bSJed Brown 98c4762a1bSJed Brown test: 99c4762a1bSJed Brown nsize: 4 100c4762a1bSJed Brown 101c4762a1bSJed Brown TEST*/ 102c4762a1bSJed Brown 103