- Instance instance(name, num_processes, process_count, MPI_COMM_NULL, MSG_barrier_init(num_processes));
+ Instance instance(std::string(name), num_processes, MPI_COMM_NULL, new simgrid::s4u::Barrier(num_processes));
+ MPI_Group group = new simgrid::smpi::Group(instance.size);
+ instance.comm_world = new simgrid::smpi::Comm(group, nullptr);
+// FIXME : using MPI_Attr_put with MPI_UNIVERSE_SIZE is forbidden and we make it a no-op (which triggers a warning as MPI_ERR_ARG is returned).
+// Directly calling Comm::attr_put breaks for now, as MPI_UNIVERSE_SIZE,is <0
+// instance.comm_world->attr_put<simgrid::smpi::Comm>(MPI_UNIVERSE_SIZE, reinterpret_cast<void*>(instance.size));