1c4762a1bSJed Brown static char help[] = "Example of using graph partitioning to partition a graph\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown /*T 4c4762a1bSJed Brown Concepts: Mat^mat partitioning 5c4762a1bSJed Brown Concepts: Mat^image segmentation 6c4762a1bSJed Brown Processors: n 7c4762a1bSJed Brown T*/ 8c4762a1bSJed Brown 9c4762a1bSJed Brown #include <petscmat.h> 10c4762a1bSJed Brown 11c4762a1bSJed Brown int main(int argc, char **args) 12c4762a1bSJed Brown { 13c4762a1bSJed Brown Mat A; 14c4762a1bSJed Brown MatPartitioning part; 15c4762a1bSJed Brown IS is; 16c4762a1bSJed Brown PetscInt r,N = 10, start, end, *vweights; 17c4762a1bSJed Brown PetscBool set_vweights=PETSC_FALSE,use_edge_weights=PETSC_FALSE; 18c4762a1bSJed Brown PetscMPIInt rank; 19c4762a1bSJed Brown MPI_Comm comm; 20c4762a1bSJed Brown 21*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscInitialize(&argc, &args, (char*) 0, help)); 22c4762a1bSJed Brown comm = PETSC_COMM_WORLD; 235f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetInt(NULL,NULL, "-N", &N, NULL)); 245f80ce2aSJacob Faibussowitsch CHKERRMPI(MPI_Comm_rank(comm,&rank)); 255f80ce2aSJacob Faibussowitsch CHKERRQ(MatCreate(comm, &A)); 265f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, N, N)); 275f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetFromOptions(A)); 285f80ce2aSJacob Faibussowitsch CHKERRQ(MatSeqAIJSetPreallocation(A, 3, NULL)); 295f80ce2aSJacob Faibussowitsch CHKERRQ(MatMPIAIJSetPreallocation(A, 3, NULL, 2, NULL)); 305f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetBool(NULL,NULL,"-test_vertex_weights",&set_vweights,NULL)); 315f80ce2aSJacob Faibussowitsch CHKERRQ(PetscOptionsGetBool(NULL,NULL,"-test_use_edge_weights",&use_edge_weights,NULL)); 32c4762a1bSJed Brown /* Create a linear mesh */ 335f80ce2aSJacob Faibussowitsch CHKERRQ(MatGetOwnershipRange(A, &start, &end)); 34c4762a1bSJed Brown if (set_vweights) { 355f80ce2aSJacob Faibussowitsch CHKERRQ(PetscMalloc1(end-start,&vweights)); 36c4762a1bSJed Brown for (r = start; r < end; ++r) 37c4762a1bSJed Brown vweights[r-start] = rank+1; 38c4762a1bSJed Brown } 39c4762a1bSJed Brown for (r = start; r < end; ++r) { 40c4762a1bSJed Brown if (r == 0) { 41c4762a1bSJed Brown PetscInt cols[2]; 42c4762a1bSJed Brown PetscScalar vals[2]; 43c4762a1bSJed Brown 44c4762a1bSJed Brown cols[0] = r; cols[1] = r+1; 45c4762a1bSJed Brown vals[0] = 1.0; vals[1] = use_edge_weights? 2.0: 1.0; 46c4762a1bSJed Brown 475f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(A, 1, &r, 2, cols, vals, INSERT_VALUES)); 48c4762a1bSJed Brown } else if (r == N-1) { 49c4762a1bSJed Brown PetscInt cols[2]; 50c4762a1bSJed Brown PetscScalar vals[2]; 51c4762a1bSJed Brown 52c4762a1bSJed Brown cols[0] = r-1; cols[1] = r; 53c4762a1bSJed Brown vals[0] = use_edge_weights? 3.0:1.0; vals[1] = 1.0; 54c4762a1bSJed Brown 555f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(A, 1, &r, 2, cols, vals, INSERT_VALUES)); 56c4762a1bSJed Brown } else { 57c4762a1bSJed Brown PetscInt cols[3]; 58c4762a1bSJed Brown PetscScalar vals[3]; 59c4762a1bSJed Brown 60c4762a1bSJed Brown cols[0] = r-1; cols[1] = r; cols[2] = r+1; 61c4762a1bSJed Brown /* ADJ matrix needs to be symmetric */ 62c4762a1bSJed Brown vals[0] = use_edge_weights? (cols[0]==0? 2.0:5.0):1.0; 63c4762a1bSJed Brown vals[1] = 1.0; 64c4762a1bSJed Brown vals[2] = use_edge_weights? (cols[2]==N-1? 3.0:5.0):1.0; 65c4762a1bSJed Brown 665f80ce2aSJacob Faibussowitsch CHKERRQ(MatSetValues(A, 1, &r, 3, cols, vals, INSERT_VALUES)); 67c4762a1bSJed Brown } 68c4762a1bSJed Brown } 695f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 705f80ce2aSJacob Faibussowitsch CHKERRQ(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 71c4762a1bSJed Brown 725f80ce2aSJacob Faibussowitsch CHKERRQ(MatPartitioningCreate(comm, &part)); 735f80ce2aSJacob Faibussowitsch CHKERRQ(MatPartitioningSetAdjacency(part, A)); 74c4762a1bSJed Brown if (set_vweights) { 755f80ce2aSJacob Faibussowitsch CHKERRQ(MatPartitioningSetVertexWeights(part,vweights)); 76c4762a1bSJed Brown } 77c4762a1bSJed Brown if (use_edge_weights) { 785f80ce2aSJacob Faibussowitsch CHKERRQ(MatPartitioningSetUseEdgeWeights(part,use_edge_weights)); 79c4762a1bSJed Brown 805f80ce2aSJacob Faibussowitsch CHKERRQ(MatPartitioningGetUseEdgeWeights(part,&use_edge_weights)); 8128b400f6SJacob Faibussowitsch PetscCheck(use_edge_weights,comm,PETSC_ERR_ARG_INCOMP, "use_edge_weights flag does not setup correctly "); 82c4762a1bSJed Brown } 835f80ce2aSJacob Faibussowitsch CHKERRQ(MatPartitioningSetFromOptions(part)); 845f80ce2aSJacob Faibussowitsch CHKERRQ(MatPartitioningApply(part, &is)); 855f80ce2aSJacob Faibussowitsch CHKERRQ(ISView(is, PETSC_VIEWER_STDOUT_WORLD)); 865f80ce2aSJacob Faibussowitsch CHKERRQ(ISDestroy(&is)); 875f80ce2aSJacob Faibussowitsch CHKERRQ(MatPartitioningDestroy(&part)); 88c4762a1bSJed Brown 895f80ce2aSJacob Faibussowitsch CHKERRQ(MatDestroy(&A)); 90*b122ec5aSJacob Faibussowitsch CHKERRQ(PetscFinalize()); 91*b122ec5aSJacob Faibussowitsch return 0; 92c4762a1bSJed Brown } 93c4762a1bSJed Brown 94c4762a1bSJed Brown /*TEST 95c4762a1bSJed Brown 96c4762a1bSJed Brown test: 97c4762a1bSJed Brown nsize: 3 98c4762a1bSJed Brown requires: parmetis 99c4762a1bSJed Brown args: -mat_partitioning_type parmetis 100c4762a1bSJed Brown 101c4762a1bSJed Brown test: 102c4762a1bSJed Brown suffix: 2 103c4762a1bSJed Brown nsize: 3 104c4762a1bSJed Brown requires: ptscotch 105c4762a1bSJed Brown args: -mat_partitioning_type ptscotch 106c4762a1bSJed Brown 107c4762a1bSJed Brown test: 108c4762a1bSJed Brown suffix: 3 109c4762a1bSJed Brown nsize: 4 110c4762a1bSJed Brown requires: party 111c4762a1bSJed Brown args: -mat_partitioning_type party 112c4762a1bSJed Brown 113c4762a1bSJed Brown test: 114c4762a1bSJed Brown suffix: 4 115c4762a1bSJed Brown nsize: 3 116c4762a1bSJed Brown requires: chaco 117c4762a1bSJed Brown args: -mat_partitioning_type chaco 118c4762a1bSJed Brown 119c4762a1bSJed Brown test: 120c4762a1bSJed Brown suffix: 5 121c4762a1bSJed Brown nsize: 3 122c4762a1bSJed Brown requires: parmetis 123c4762a1bSJed Brown args: -mat_partitioning_type hierarch -mat_partitioning_hierarchical_nfineparts 3 -mat_partitioning_nparts 10 -N 100 124c4762a1bSJed Brown 125c4762a1bSJed Brown test: 126c4762a1bSJed Brown suffix: 6 127c4762a1bSJed Brown nsize: 3 128c4762a1bSJed Brown requires: parmetis 129c4762a1bSJed Brown args: -mat_partitioning_type hierarch -mat_partitioning_hierarchical_nfineparts 3 -mat_partitioning_nparts 10 -N 100 -test_vertex_weights 1 -mat_partitioning_use_edge_weights 1 130c4762a1bSJed Brown 131c4762a1bSJed Brown test: 132c4762a1bSJed Brown suffix: 7 133c4762a1bSJed Brown nsize: 2 134c4762a1bSJed Brown requires: parmetis 135c4762a1bSJed Brown args: -mat_partitioning_type hierarch -mat_partitioning_hierarchical_nfineparts 2 -mat_partitioning_nparts 10 -mat_partitioning_hierarchical_fineparttype hierarch -malloc_dump -N 100 -mat_partitioning_improve 1 136c4762a1bSJed Brown 137c4762a1bSJed Brown test: 138c4762a1bSJed Brown suffix: 8 139c4762a1bSJed Brown nsize: 2 140c4762a1bSJed Brown requires: parmetis 141c4762a1bSJed Brown args: -mat_partitioning_type parmetis -mat_partitioning_nparts 3 -test_use_edge_weights 1 142c4762a1bSJed Brown 143c4762a1bSJed Brown test: 144c4762a1bSJed Brown suffix: 9 145c4762a1bSJed Brown nsize: 2 146c4762a1bSJed Brown requires: ptscotch 147c4762a1bSJed Brown args: -mat_partitioning_type ptscotch -mat_partitioning_nparts 3 -test_use_edge_weights 1 -mat_partitioning_ptscotch_proc_weight 0 148c4762a1bSJed Brown 149c4762a1bSJed Brown TEST*/ 150