Journal of Software:2011.22(zk2):182-191

(北京航空航天大学 计算机学院,北京 100191)
Study on Performance Simulation of Interconnection Network under Complex Workload Mode
(School of Computer Science and Engineering, BeiHang University, Beijing 100191, China)
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Received:July 15, 2011    Revised:December 02, 2011
> 中文摘要: 大规模并行计算机系统互连网络的设计对并行程序执行效率有重要影响,当前千万亿次计算机系统拥有上万个节点,给互连网络的性能带来新的挑战.然而,目前互连网络性能研究大多考虑消息目的地均匀分布等简单负载模型,这与真实并行应用的网络负载存在较大差异.首先,在简单负载模型的基础上,增加考虑局部通信、热点通信等因素,研究更接近真实网络负载特性的复杂负载模型.其次,基于此前对互连网络建立的数学模型,扩展了一个微片级网络模拟器,以支持模拟复杂负载模型;最后,通过大量模拟实验比较了Torus 和Fat Tree 网络在各种复杂负载模型下的性能,并以3D FFT 算法的2D 任务分解为例,模拟互连网络的消息延迟.模拟实验的数据和分析,给大规模并行计算机互连网络的设计、提升并行程序执行效率提供了帮助.
Abstract:The interconnection network’s design of large-scale parallel computer systems is significant to the execturion of the efficiency of parallel programs. Currently, the Petaflop supercomputers usually have more than ten thousand computing nodes, which cause new challenges to the performance of interconnection network. However, most exited studies only consider simple network workload models which have many differences from the workloads of real parallel applications. This paper presents complex workload models which are more similar to the practical network workload. Then based on the mathematical model of the interconnection network in the earlier study, the study uses a flit-level network simulator to support analyzing those complex workload models. Finally, through a great deal of experiments the performance of Torus and Fat Tree network topologies are compared under different workload models. Meanwhile, the message mean latency of the 3D FFT parallel algorithm using 2D partitioning is simulated. The results and related analysis efficiently support the large-scale interconnection network’s design, as well as the optimization of parallel programs.
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基金项目:国家自然科学基金(61073013); 航空科学基金(2010ZA04001) 国家自然科学基金(61073013); 航空科学基金(2010ZA04001)
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HU Kai,CHEN Lu-Jia,WANG Zhe,JIANG Shu.Study on Performance Simulation of Interconnection Network under Complex Workload Mode.Journal of Software,2011,22(zk2):182-191