- An Evaluation of the Impacts of Network Bandwidth and Dual-Core Processors on Scalability, Ron Brightwell, Keith D. Underwood, and Courtenay Vaughan, Sandia National Laboratories, USA. This paper will look at the impact of the recent upgrade of Sandia’s Cray Red Storm system on the performance of several applications and micro-benchmarks. Red Storm’s single-core, 2 GHz AMD Opteron processors were replaced with dual-core, 2.4 GHz AMD Opterons and the network interface hardware was upgraded from a sustained rate of 1.1 GB/s to 2 GB/s. The authors will show scaling results for applications out to thousands of processors and include an analysis of the impact of using dual-core processors on the system.
- A Language Design for Non-Interruptible Multithreading Environment Fuce, Satoshi Amamiya, Ryuzo Hasegawa, Hiroshi Fujita, Miyuki Koshimura, Ryo Hirana, and Makoto Amamiya, Kyushu University, Japan. This paper will examine the development of a multithread architecture and OS called Fuce, which is designed to directly support parallel execution. It will describe the language design and some parallel programming techniques needed to implement the Fuce OS. Experimental results obtained by the Fuce clock-level software simulator also will be discussed.
For more on the ISC ’07 award winning papers and for a Scientific Day schedule that includes abstracts of all 16 papers, see www.isc07.org/scientific_day. Online Advance registration for ISC ’07 is open through May 26. A registration form is available at www.isc07.org/registration.

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