if (inMemory) { //TODO: this has been disabled
                    for (Vertex v : q.vertices()) {
                        v.getId();
                    }
                } else {
                    VertexList vl = q.vertexIds();
                    for (int j = 0; j < vl.size(); j++) {
                        vl.get(j);
                    }
                }
            }
            time = time() - time;
            System.out.println("Ngh retrieval: " + time);