Figure 7. Routing direction from center nodes to side nodes in torus network.

VI. SIMULATION AND RESULTS ANALYSIS

We have studied various approaches to balance the distribution of work load in the network. In this section we will use OPNET to simulate the hierarchical mechanism of the Mesh-of-Torus network and the corresponding routing algorithm [26] [27]. In this part, we will also compare the performance of Mesh-of-Torus network with that of mesh network.

6.1 Simulation Design

The simulation platform is composed of data and control planes viewing from the system constitution point. The data plane includes the topology we used for the simulation platform, server microstructure, physical link parameters and so on. And we need to use control plane to govern the duration of simulation, time and space of packets flow, business scale or other parameters.
Simulation will choose a switching mechanism to employ in the network automatically. At the beginning of this simulation, the automatic routing algorithm will configure routing table for each server in accordance with the topology, scale and hierarchical mechanism of the network.
Servers should generate business along with the change of flow pattern. And they are also responsible for defining the business format and recording data during the simulation process. We judge the performance of network by the utilization of end-to-end and link. The end-to-end latency can be represented as:
We use