- Instance instance(name, num_processes, process_count, MPI_COMM_NULL, MSG_barrier_init(num_processes));
+ Instance instance(std::string(name), num_processes, process_count, MPI_COMM_NULL, MSG_barrier_init(num_processes));
+ MPI_Group group = new simgrid::smpi::Group(instance.size);
+ instance.comm_world = new simgrid::smpi::Comm(group, nullptr);
+ MPI_Attr_put(instance.comm_world, MPI_UNIVERSE_SIZE, reinterpret_cast<void*>(instance.size));