MSG_process_create( "host", host, NULL, first_host);
xbt_dynar_free(&all_hosts);
res = MSG_main();
XBT_INFO("Simulation time %g", MSG_get_clock());
MSG_process_create( "host", host, NULL, first_host);
xbt_dynar_free(&all_hosts);
res = MSG_main();
XBT_INFO("Simulation time %g", MSG_get_clock());