1 /* 2 Simple example demonstrating creating a one sub-network DMNetwork in parallel. 3 4 In this example vertices 0 and 1 are not connected to any edges. 5 */ 6 7 #include <petscdmnetwork.h> 8 9 int main(int argc, char **argv) 10 { 11 DM network; 12 PetscMPIInt size, rank; 13 MPI_Comm comm; 14 PetscInt e, ne, nv, v, ecompkey, vcompkey; 15 PetscInt *edgelist = NULL; 16 const PetscInt *nodes, *edges; 17 DM plex; 18 PetscSection section; 19 PetscInt Ne, Ni; 20 PetscInt nodeOffset, k = 2, nedge; 21 22 PetscFunctionBeginUser; 23 PetscCall(PetscInitialize(&argc, &argv, NULL, NULL)); 24 PetscCall(PetscOptionsSetValue(NULL, "-petscpartitioner_use_vertex_weights", "No")); 25 comm = PETSC_COMM_WORLD; 26 PetscCallMPI(MPI_Comm_rank(comm, &rank)); 27 PetscCallMPI(MPI_Comm_size(comm, &size)); 28 29 PetscCall(DMNetworkCreate(PETSC_COMM_WORLD, &network)); 30 31 /* Register zero size components to get compkeys to be used by DMNetworkAddComponent() */ 32 PetscCall(DMNetworkRegisterComponent(network, "ecomp", 0, &ecompkey)); 33 PetscCall(DMNetworkRegisterComponent(network, "vcomp", 0, &vcompkey)); 34 35 Ne = 2; 36 Ni = 1; 37 nodeOffset = (Ne + Ni) * rank; /* The global node index of the first node defined on this process */ 38 39 /* There are three nodes on each rank and two edges. The edges only connect nodes on the given rank */ 40 nedge = k * Ni; 41 42 if (rank == 0) { 43 nedge = 1; 44 PetscCall(PetscCalloc1(2 * nedge, &edgelist)); 45 edgelist[0] = nodeOffset + 2; 46 edgelist[1] = nodeOffset + 3; 47 } else { 48 nedge = 2; 49 PetscCall(PetscCalloc1(2 * nedge, &edgelist)); 50 edgelist[0] = nodeOffset + 0; 51 edgelist[1] = nodeOffset + 2; 52 edgelist[2] = nodeOffset + 1; 53 edgelist[3] = nodeOffset + 2; 54 } 55 56 PetscCall(DMNetworkSetNumSubNetworks(network, PETSC_DECIDE, 1)); 57 PetscCall(DMNetworkAddSubnetwork(network, "Subnetwork 1", nedge, edgelist, NULL)); 58 PetscCall(DMNetworkLayoutSetUp(network)); 59 60 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Network after DMNetworkLayoutSetUp:\n")); 61 PetscCall(DMView(network, PETSC_VIEWER_STDOUT_WORLD)); 62 63 /* Add components and variables for the network */ 64 PetscCall(DMNetworkGetSubnetwork(network, 0, &nv, &ne, &nodes, &edges)); 65 for (e = 0; e < ne; e++) { 66 /* The edges have no degrees of freedom */ 67 PetscCall(DMNetworkAddComponent(network, edges[e], ecompkey, NULL, 1)); 68 } 69 for (v = 0; v < nv; v++) PetscCall(DMNetworkAddComponent(network, nodes[v], vcompkey, NULL, 2)); 70 71 PetscCall(DMSetUp(network)); 72 PetscCall(DMNetworkGetPlex(network, &plex)); 73 /* PetscCall(DMView(plex,PETSC_VIEWER_STDOUT_WORLD)); */ 74 PetscCall(DMGetLocalSection(plex, §ion)); 75 PetscCall(PetscSectionView(section, PETSC_VIEWER_STDOUT_WORLD)); 76 77 PetscCall(PetscFree(edgelist)); 78 79 PetscCall(DMNetworkDistribute(&network, 0)); 80 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "\nNetwork after DMNetworkDistribute:\n")); 81 PetscCall(DMView(network, PETSC_VIEWER_STDOUT_WORLD)); 82 PetscCall(DMNetworkGetPlex(network, &plex)); 83 /* PetscCall(DMView(plex,PETSC_VIEWER_STDOUT_WORLD)); */ 84 PetscCall(DMGetLocalSection(plex, §ion)); 85 PetscCall(PetscSectionView(section, PETSC_VIEWER_STDOUT_WORLD)); 86 87 PetscCall(DMDestroy(&network)); 88 PetscCall(PetscFinalize()); 89 return 0; 90 } 91 92 /*TEST 93 94 build: 95 requires: !complex double 96 97 test: 98 nsize: 2 99 args: -petscpartitioner_type simple 100 101 TEST*/ 102