The documents distributed by this server have been provided by the contributing authors as a means to ensure timely dissemination of scholarly and technical work on a noncommercial basis. Copyright and all rights therein are maintained by the authors or by other copyright holders, notwithstanding that they have offered their works here electronically. It is understood that all persons copying this information will adhere to the terms and constraints invoked by each author's copyright. These works may not be reposted without the explicit permission of the copyright holder.
Publications of SPCL
|T. Hoefler, T. Schneider and A. Lumsdaine:|
|LogGP in Theory and Practice - An In-depth Analysis of Modern Interconnection Networks and Benchmarking Methods for Collective Operations.|
(Elsevier Journal of Simulation Modelling Practice and Theory (SIMPAT). Vol 17, Nr. 9, In , presented in , pages 1511-1521, Elsevier, ISSN: 1569-190X, ISBN: , Oct. 2009, )
AbstractAccurate measurement and modeling of network performance is important for predicting and optimizing the running time of high-performance computing applications. Although the LogP family of models has proven to be a valuable tool for assessing the communication performance of parallel architectures, non-intrusive LogP parameter assessment of real systems remains a difficult task. Based on an analysis of accuracy and contention properties of existing measurement methods, we develop a new low-overhead measurement method which also assesses protocol changes in the underlying transport layers. We use the gathered parameters to simulate LogGP models of collective operations and demonstrate the errors in common benchmarking methods for collective operations. The simulations provide new insight into the nature of collective algorithms and their pipelining properties. We show that the error grows linearly with the system size.