Type of Document	Master's Thesis
Author	Braithwaite, Ryan Karl
Author's Email Address	rkb@vt.edu
URN	etd-02062012-121115
Title	NUMA Data-Access Bandwidth Characterization and Modeling
Degree	Master of Science
Department	Computer Science and Applications
Advisory Committee	Advisor Name Title Feng, Wu-Chun Committee Chair McCormick, Patrick Committee Member Ribbens, Calvin J. Committee Member
Keywords	Performance Modeling NUMA Benchmarking
Date of Defense	2012-01-23
Availability	unrestricted
Abstract Clusters of seemingly homogeneous compute nodes are increasingly heterogeneous within each node due to replication and distribution of node-level subsystems. This intra-node heterogeneity can adversely affect program execution performance by inflicting additional data-access performance penalties when accessing non-local data. In many modern NUMA architectures, both memory and I/O controllers are distributed within a node and CPU cores are logically divided into “local” and “remote” data-accesses within the system. In this thesis a method for analyzing main memory and PCIe data-access characteristics of modern AMD and Intel NUMA architectures is presented. Also presented here is the synthesis of data-access performance models designed to quantify the effects of these architectural characteristics on data-access bandwidth. Such performance models provide an analytical tool for determining the performance impact of remote data-accesses for a program or access pattern running in a given system. Data-access performance models also provide a means for comparing the data-access bandwidth and attributes of NUMA architectures, for improving application performance when running on these architectures, and for improving process/thread mapping onto CPU cores in these architectures. Preliminary examples of how programs respond to these data-access bandwidth characteristics are also presented as motivation for future work.
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