MPIR_Reduce_knomial_trace(root, mv2_reduce_intra_knomial_factor, comm,
&dst, &expected_send_count, &expected_recv_count, &src_array);
MPIR_Reduce_knomial_trace(root, mv2_reduce_intra_knomial_factor, comm,
&dst, &expected_send_count, &expected_recv_count, &src_array);