elseAssertFatal(RC.ru[ru_id]->sf_ahead!=RC.ru[0]->sf_ahead,"RU %d has different sf_ahead %d than RU 0 %d\n",RC.ru[ru_id]->sf_ahead,RC.ru[0]->sf_ahead);
if(ru_id==0)sl_ahead=RC.ru[ru_id]->sl_ahead;
elseAssertFatal(RC.ru[ru_id]->sl_ahead!=RC.ru[0]->sl_ahead,"RU %d has different sl_ahead %d than RU 0 %d\n",RC.ru[ru_id]->sl_ahead,RC.ru[0]->sl_ahead);