中文摘要：

我国水利行业对计算力需求不断增加，该文利用P2P技术汇聚Pc的空闲CPU资源，来提供低成本的高计算力。针对水利信息网络的现状，以XtremWeb计算平台为基础，构造了基于广域网和局域网的两层XtremWeb网络，并采用多服务窗排队理论进行建模和分析，得到模型的相关参数。给出洪水淹没范围计算的具体实例，采用XtremWeb网络进行实验。实验结果表明，随着Worker数量的增加，实际计算耗时快速下降，系统吞吐量接近线性增长。

英文摘要：

The computing capability has been demanded increasingly in the industry of water resources in China. In this paper, P2P technology is introduced to collect idle CPU resources to provide high computing capability at a low cost. WAN and LAN-based two-layer XtremWeb network is created on XtremWeb computing platform according to the current situation of water information network. Its relevant model is constructed and analyzed with the theory of M/M/N queue to acquire parameters. And the experiments are taken with XtremWeb network on an example of flooded areas. The results show that the actual time of computing declines rapidly and the system＇s volume is close to linear growth while the number of worker increases.