Requirements for Asci

By by Jason

Book Id: WPLBN0000130608
Format Type: PDF eBook:
File Size: 4.67 MB
Reproduction Date: 2008

Title:	Requirements for Asci
Author:	by Jason
Volume:
Language:	English
Subject:	Government publications, Legislation., Government Printing Office (U.S.)
Collections:	Government Library Collection
Historic Publication Date:
Publisher:	Government Printing Office


Citation APA MLA Chicago Jason, B. (n.d.). Requirements for Asci. Retrieved from http://gutenberg.cc/

Excerpt
Excerpt: This section summarizes the conclusions and recommendations of the 2003 JASON summer study commissioned by the National Nuclear Security Administration (NNSA) to identify the distinct requirements of its stockpile stewardship program (SSP) in relation to the hardware procurement strategy of the Advanced Simulation and Computing (ASCI) program. In particular, we were tasked to evaluate the increased risk to the nuclear weapons (NW) stockpile and the scientific program of SSP as a result of delaying computer acquisitions intended to advance computing capability. We were also charged to consider the confidence in our NW simulation capability and the appropriate balance between near-, intermediate- and long-term SSP needs for acquiring new hardware with increased computing capability.

Table of Contents
Contents 1 EXECUTIVE SUMMARY 1 2 INTRODUCTION 5 2.1 Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Summer Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 The ASCI Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 ASCI PROGRAM REQUIREMENTS 9 3.1 Components of the Stockpile Stewardship Program and Their Demands onASCI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.2 STS and Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.3 Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.4 The JASON S-Matrix . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 SCIENCE: ACCOMPLISHMENTS. CREDIBILITY AND OPPORTUNITIES 19 4.1 Introduction: A Central Role for ASCI in SSP Science . . . . . . . . 19 4.2 Notable Scientific Advances and Their Impact on ASCI Programmatics 20 4.3 Assessment of Scientific Credibility . . . . . . . . . . . . . . . . . . . 22 4.4 Simulating Turbulent Hydrodynamics . . . . . . . . . . . . . . . . . . 25 5 COMPUTER SCIENCE ISSUES 31 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.2 Overview of Parallel Computer Architecture . . . . . . . . . . . . . . 31 5.2.1 Processing Node . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.2.2 InterconnectionNetwork . . . . . . . . . . . . . . . . . . . . . 35 5.2.3 Taxonomy of High-End Scientific Computers . . . . . . . . . . 36 5.2.4 Economics of Computer Hardware . . . . . . . . . . . . . . . . 38 5.3 Capability and Capacity Requirements . . . . . . . . . . . . . . . . . 41 5.4 Performance Issues for ASCI Codes . . . . . . . . . . . . . . . . . . . 41 5.5 Analysis and Recommendat ions . . . . . . . . . . . . . . . . . . . . . 44 5.5.1 Single processor performance . . . . . . . . . . . . . . . . . . . 44 5.5.2 Emerging Parallel Computer Architectures . . . . . . . . . . . 51 5.5.3 Software Issues . . . . . . . . . . . . . . . . . . . . . . . . . . 55 5.5.4 Management and Procurement Issues . . . . . . . . . . . . . . 56 6 ACQUISITION SCENARIOS 59 6.1 Original NNSA Procurement Strategy . . . . . . . . . . . . . . . . . . 59 6.2 Assessing the Risk of Deferred Acquisition . . . . . . . . . . . . . . . 61 6.3 Capability and Capacity using Commodity Clusters . . . . . . . . . . 63 6.4 A Requirements-Driven Acquisition Scenario . . . . . . . . . . . . . . 65