peersim仿真chord协议的测试过的环境，可以直接运行，也可以在此基基础上改变初始设置来做仿真实验。在eclipse下打开源文件夹为工程即可使用。 -the tested environment peersim simulation chord agreement, can directly run the initial setup to do the simulation experiments, also can be changed on the basis of base.