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Commonly represented as directed graphs, social networks depict relationships and behaviors among social entities such as people, groups, and organizations. Social network analysis denotes a class of mathematical and statistical methods designed to study and measure social networks. Beyond sociology, social network analysis methods are being applied to other types of data in other domains such as...
Several 64-processor XMT systems have now been shipped to customers and there have been 128-processor, 256-processor and 512-processor systems tested in Cray's development lab. We describe some techniques we have used for tuning performance in hopes that applications continued to scale on these larger systems. We discuss how the programmer must work with the XMT compiler to extract maximum parallelism...
String searching is at the core of many security and network applications like search engines, intrusion detection systems, virus scanners and spam filters. The growing size of on-line content and the increasing wire speeds push the need for fast, and often real-time, string searching solutions. For these conditions, many software implementations (if not all) targeting conventional cache-based microprocessors...
This paper describes our early experiences with a pre- production Cray XMT system that implements a scalable shared memory architecture with hardware support for multithreading. Unlike its predecessor, the Cray MTA-2 that had very limited I/O capability, the Cray XMT offers Lustre, a scalable high-performance parallel filesystem. Therefore it enables development of out-of-core applications that can...
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