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 PetscCall(PetscInitialize(&argc,&argv,NULL,NULL)); 23 PetscCall(PetscOptionsSetValue(NULL,"-petscpartitioner_use_vertex_weights","No")); 24 comm = PETSC_COMM_WORLD; 25 PetscCallMPI(MPI_Comm_rank(comm,&rank)); 26 PetscCallMPI(MPI_Comm_size(comm,&size)); 27 28 PetscCall(DMNetworkCreate(PETSC_COMM_WORLD,&network)); 29 30 /* Register zero size components to get compkeys to be used by DMNetworkAddComponent() */ 31 PetscCall(DMNetworkRegisterComponent(network,"ecomp",0,&ecompkey)); 32 PetscCall(DMNetworkRegisterComponent(network,"vcomp",0,&vcompkey)); 33 34 Ne = 2; 35 Ni = 1; 36 nodeOffset = (Ne+Ni)*rank; /* The global node index of the first node defined on this process */ 37 38 /* There are three nodes on each rank and two edges. The edges only connect nodes on the given rank */ 39 nedge = k * Ni; 40 41 if (rank == 0) { 42 nedge = 1; 43 PetscCall(PetscCalloc1(2*nedge,&edgelist)); 44 edgelist[0] = nodeOffset + 2; 45 edgelist[1] = nodeOffset + 3; 46 } else { 47 nedge = 2; 48 PetscCall(PetscCalloc1(2*nedge,&edgelist)); 49 edgelist[0] = nodeOffset + 0; 50 edgelist[1] = nodeOffset + 2; 51 edgelist[2] = nodeOffset + 1; 52 edgelist[3] = nodeOffset + 2; 53 } 54 55 PetscCall(DMNetworkSetNumSubNetworks(network,PETSC_DECIDE,1)); 56 PetscCall(DMNetworkAddSubnetwork(network,"Subnetwork 1",nedge,edgelist,NULL)); 57 PetscCall(DMNetworkLayoutSetUp(network)); 58 59 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Network after DMNetworkLayoutSetUp:\n")); 60 PetscCall(DMView(network,PETSC_VIEWER_STDOUT_WORLD)); 61 62 /* Add components and variables for the network */ 63 PetscCall(DMNetworkGetSubnetwork(network,0,&nv,&ne,&nodes,&edges)); 64 for (e = 0; e < ne; e++) { 65 /* The edges have no degrees of freedom */ 66 PetscCall(DMNetworkAddComponent(network,edges[e],ecompkey,NULL,1)); 67 } 68 for (v = 0; v < nv; v++) { 69 PetscCall(DMNetworkAddComponent(network,nodes[v],vcompkey,NULL,2)); 70 } 71 72 PetscCall(DMSetUp(network)); 73 PetscCall(DMNetworkGetPlex(network,&plex)); 74 /* PetscCall(DMView(plex,PETSC_VIEWER_STDOUT_WORLD)); */ 75 PetscCall(DMGetLocalSection(plex,§ion)); 76 PetscCall(PetscSectionView(section,PETSC_VIEWER_STDOUT_WORLD)); 77 78 PetscCall(PetscFree(edgelist)); 79 80 PetscCall(DMNetworkDistribute(&network,0)); 81 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nNetwork after DMNetworkDistribute:\n")); 82 PetscCall(DMView(network,PETSC_VIEWER_STDOUT_WORLD)); 83 PetscCall(DMNetworkGetPlex(network,&plex)); 84 /* PetscCall(DMView(plex,PETSC_VIEWER_STDOUT_WORLD)); */ 85 PetscCall(DMGetLocalSection(plex,§ion)); 86 PetscCall(PetscSectionView(section,PETSC_VIEWER_STDOUT_WORLD)); 87 88 PetscCall(DMDestroy(&network)); 89 PetscCall(PetscFinalize()); 90 return 0; 91 } 92 93 /*TEST 94 95 build: 96 requires: !complex double 97 98 test: 99 nsize: 2 100 args: -petscpartitioner_type simple 101 102 TEST*/ 103