I am student of Computer Science in Universidad de Oriente from Cuba, and I have a problem with the parallel graph, when I am adding edge betwen two procesors and one of them change any property of my edge, the other processor not update the property . for example my code is : #include "mpi.h" #include #include #include #include #include #include #include <list> using namespace std; //===============================Vertex================================ struct Vertex{ int id; // Serialization support is required! template<typename Archiver> void serialize(Archiver& ar, const unsigned int ) { ar & id ; } Vertex(int id = 0): id(id){} }; //===============================Edge================================ struct Edge{ int type; Edge( int type = 0): type(type){ } // Serialization support is required! template<typename Archiver> void serialize(Archiver& ar,const unsigned int ) { ar & type; } }; using namespace boost; using boost::graph::distributed::mpi_process_group; typedef adjacency_list < listS, distributedS, undirectedS, Vertex, Edge > Graph; typedef typename Graph::edge_descriptor edge_descriptor; typedef typename Graph::vertex_descriptor vertex_descriptor; int main (int argc, char ** argv){ boost::mpi::environment env(argc,argv); mpi::communicator world; Graph g; vertex_descriptor vi,vj; property_map::type type1 = get(&Edge::type, g); if (g.processor()==0) vi = add_vertex(Vertex(1),g); if (g.processor()==1) vj = add_vertex(Vertex(2),g); broadcast(world, vj, 1); broadcast(world, vi, 0); if (g.processor()==0){ pair p = add_edge(vi, vj, Edge(1), g); std::cout<<"Process "< p = edge(vi, vj, g); if(p.second){ std::cout<<"\nProcess "< p = edge(vi, vj, g); std::cout<<"\nProcess "<