simgrid::s4u::this_actor::send(neighbor_mailbox, xbt_strdup("Token"), task_comm_size);
char* res = static_cast<char*>(simgrid::s4u::this_actor::recv(my_mailbox));
XBT_INFO("Host \"%u\" received \"%s\"", rank, res);
simgrid::s4u::this_actor::send(neighbor_mailbox, xbt_strdup("Token"), task_comm_size);
char* res = static_cast<char*>(simgrid::s4u::this_actor::recv(my_mailbox));
XBT_INFO("Host \"%u\" received \"%s\"", rank, res);