National Academies Press: OpenBook
Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
×

GETTING UP TO SPEED THE FUTURE OF SUPERCOMPUTING

Susan L. Graham, Marc Snir, and Cynthia A. Patterson, Editors

Committee on the Future of Supercomputing

Computer Science and Telecommunications Board

Division on Engineering and Physical Sciences

NATIONAL RESEARCH COUNCIL OF THE NATIONAL ACADEMIES

THE NATIONAL ACADEMIES PRESS
Washington, D.C.
www.nap.edu

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
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THE NATIONAL ACADEMIES PRESS
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NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

Support for this project was provided by the Department of Energy under Sponsor Award No. DE-AT01-03NA00106. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the organizations that provided support for the project.

International Standard Book Number 0-309-09502-6 (Book)

International Standard Book Number 0-309-54679-6 (PDF)

Library of Congress Catalog Card Number 2004118086

Cover designed by Jennifer Bishop.

Cover images (clockwise from top right, front to back)

1. Exploding star. Scientific Discovery through Advanced Computing (SciDAC) Center for Supernova Research, U.S. Department of Energy, Office of Science.

2. Hurricane Frances, September 5, 2004, taken by GOES-12 satellite, 1 km visible imagery. U.S. National Oceanographic and Atmospheric Administration.

3. Large-eddy simulation of a Rayleigh-Taylor instability run on the Lawrence Livermore National Laboratory MCR Linux cluster in July 2003. The relative abundance of the heavier elements in our universe is largely determined by fluid instabilities and turbulent mixing inside violently exploding stars.

4. Three-dimensional model of the structure of a ras protein. Human Genome Program, U.S. Department of Energy, Office of Science.

5. Test launch of Minuteman intercontinental ballistic missile. Vandenberg Air Force Base.

6. A sample of liquid deuterium subjected to a supersonic impact, showing the formation of a shock front on the atomic scale. The simulation involved 1,320 atoms and ran for several days on 2,640 processors of Lawrence Livermore National Laboratory’s ASCI White. It provided an extremely detailed picture of the formation and propagation of a shock front on the atomic scale. Accelerated Strategic Computing Initiative (ASCI), Department of Energy, Lawrence Livermore National Laboratory.

7. Isodensity surfaces of a National Ignition Facility ignition capsule bounding the shell, shown at 200 picosec (left), 100 picosec (center), and near ignition time (right). An example of ASCI White three-dimensional computer simulations based on predictive physical models. ASCI, Lawrence Livermore National Laboratory.

Copies of this report are available from the
National Academies Press,
500 Fifth Street, N.W., Lockbox 285, Washington, DC 20055; (800) 624-6242 or (202) 334-3313 in the Washington metropolitan area; Internet, http://www.nap.edu

Copyright 2005 by the National Academy of Sciences. All rights reserved.

Printed in the United States of America

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
×

THE NATIONAL ACADEMIES

Advisers to the Nation on Science, Engineering, and Medicine

The National Academy of Sciences is a private, nonprofit, self-perpetuating society of distinguished scholars engaged in scientific and engineering research, dedicated to the furtherance of science and technology and to their use for the general welfare. Upon the authority of the charter granted to it by the Congress in 1863, the Academy has a mandate that requires it to advise the federal government on scientific and technical matters. Dr. Bruce M. Alberts is president of the National Academy of Sciences.

The National Academy of Engineering was established in 1964, under the charter of the National Academy of Sciences, as a parallel organization of outstanding engineers. It is autonomous in its administration and in the selection of its members, sharing with the National Academy of Sciences the responsibility for advising the federal government. The National Academy of Engineering also sponsors engineering programs aimed at meeting national needs, encourages education and research, and recognizes the superior achievements of engineers. Dr. Wm. A. Wulf is president of the National Academy of Engineering.

The Institute of Medicine was established in 1970 by the National Academy of Sciences to secure the services of eminent members of appropriate professions in the examination of policy matters pertaining to the health of the public. The Institute acts under the responsibility given to the National Academy of Sciences by its congressional charter to be an adviser to the federal government and, upon its own initiative, to identify issues of medical care, research, and education. Dr. Harvey V. Fineberg is president of the Institute of Medicine.

The National Research Council was organized by the National Academy of Sciences in 1916 to associate the broad community of science and technology with the Academy’s purposes of furthering knowledge and advising the federal government. Functioning in accordance with general policies determined by the Academy, the Council has become the principal operating agency of both the National Academy of Sciences and the National Academy of Engineering in providing services to the government, the public, and the scientific and engineering communities. The Council is administered jointly by both Academies and the Institute of Medicine. Dr. Bruce M. Alberts and Dr. Wm. A. Wulf are chair and vice chair, respectively, of the National Research Council.

www.national-academies.org

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
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COMMITTEE ON THE FUTURE OF SUPERCOMPUTING

SUSAN L. GRAHAM,

University of California, Berkeley,

Co-chair

MARC SNIR,

University of Illinois at Urbana-Champaign,

Co-chair

WILLIAM J. DALLY,

Stanford University

JAMES W. DEMMEL,

University of California, Berkeley

JACK J. DONGARRA,

University of Tennessee, Knoxville, and Oak Ridge National Laboratory

KENNETH S. FLAMM,

University of Texas, Austin

MARY JANE IRWIN,

Pennsylvania State University

CHARLES KOELBEL,

Rice University

BUTLER W. LAMPSON,

Microsoft Corporation

ROBERT F. LUCAS,

University of Southern California

PAUL C. MESSINA,

Distinguished senior computer scientist, Consultant

JEFFREY M. PERLOFF,

University of California, Berkeley

WILLIAM H. PRESS,

Los Alamos National Laboratory

ALBERT J. SEMTNER,

Naval Postgraduate School

SCOTT STERN,

Northwestern University

SHANKAR SUBRAMANIAM,

University of California, San Diego

LAWRENCE C. TARBELL, JR.,

Technology Futures Office, Eagle Alliance

STEVEN J. WALLACH,

Chiaro Networks

Staff

CYNTHIA A. PATTERSON, Study Director

PHIL HILLIARD, Research Associate (through May 2004)

MARGARET MARSH HUYNH, Senior Program Assistant

HERBERT S. LIN, Senior Scientist

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
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COMPUTER SCIENCE AND TELECOMMUNICATIONS BOARD

DAVID LIDDLE, U.S.

Venture Partners,

Co-chair

JEANNETTE M. WING,

Carnegie Mellon University,

Co-chair

ERIC BENHAMOU,

Benhamou Global Ventures, LLC

DAVID D. CLARK,

Massachusetts Institute of Technology,

CSTB Chair Emeritus

WILLIAM DALLY,

Stanford University

MARK E. DEAN, IBM

Almaden Research Center

DEBORAH ESTRIN,

University of California, Los Angeles

JOAN FEIGENBAUM,

Yale University

HECTOR GARCIA-MOLINA,

Stanford University

KEVIN KAHN,

Intel Corporation

JAMES KAJIYA,

Microsoft Corporation

MICHAEL KATZ,

University of California, Berkeley

RANDY H. KATZ,

University of California, Berkeley

WENDY A. KELLOGG,

IBM T.J. Watson Research Center

SARA KIESLER,

Carnegie Mellon University

BUTLER W. LAMPSON,

Microsoft Corporation,

CSTB Member Emeritus

TERESA H. MENG,

Stanford University

TOM M. MITCHELL,

Carnegie Mellon University

DANIEL PIKE, GCI

Cable and Entertainment

ERIC SCHMIDT,

Google Inc.

FRED B. SCHNEIDER,

Cornell University

WILLIAM STEAD,

Vanderbilt University

ANDREW J. VITERBI,

Viterbi Group, LLC

CHARLES N. BROWNSTEIN, Director

KRISTEN BATCH, Research Associate

JENNIFER M. BISHOP, Program Associate

JANET BRISCOE, Manager, Program Operations

JON EISENBERG, Senior Program Officer

RENEE HAWKINS, Financial Associate

MARGARET MARSH HUYNH, Senior Program Assistant

HERBERT S. LIN, Senior Scientist

LYNETTE I. MILLETT, Senior Program Officer

JANICE SABUDA, Senior Program Assistant

GLORIA WESTBROOK, Senior Program Assistant

BRANDYE WILLIAMS, Staff Assistant

For more information on CSTB, see its Web site at <http://www.cstb.org>, write to CSTB, National Research Council, 500 Fifth Street, N.W., Washington, DC 20001, call (202) 334-2605, or e-mail the CSTB at cstb@nas.edu.

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
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Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
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Preface

High-performance computing is important insolving complex problems in areas from climate and biology to national security. Several factors have led to the recent reexamination of the rationale for federal investment in research and development in support of high-performance computing, including (1) continuing changes in the various component technologies and their markets, (2) the evolution of the computing market, particularly the high-end supercomputing segment, (3) experience with several systems using the clustered processor architecture, and (4) the evolution of the problems, many of them mission-driven, for which supercomputers are used.

The Department of Energy’s (DOE’s) Office of Science expressed an interest in sponsoring a study by the Computer Science and Telecommunications Board (CSTB) of the National Research Council (NRC) that would assess the state of U.S. supercomputing capabilities and relevant research and development. Spurred by the development of the Japanese vector-based Earth Simulator supercomputer, the Senate’s Energy and Water Development Appropriations Committee directed the Advanced Simulation and Computing (ASC) program of the National Nuclear Security Administration (NNSA) at DOE to commission, in collaboration with DOE’s Office of Science, a study by the NRC. Congress also commissioned a study by the JASONs1 to identify the distinct requirements of the stockpile stewardship program and its relation to the ASC acquisition strategy.

1  

Formed in 1959, the JASONs are a select group of scientific advisors who consult with the federal government, chiefly on classified research issues.

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CSTB convened the Committee on the Future of Supercomputing to assess prospects for supercomputing technology research and development in support of U.S. needs, to examine key elements of context—the history of supercomputing, the erosion of research investment, the changing nature of the problems demanding supercomputing, and the needs of government agencies for supercomputing capabilities—and to assess opportunities for progress. The 18 distinguished members of the study committee (see Appendix A for their biographies) were drawn from academia, industry, and government research organizations in the United States. Several committee members have had previous government and/or industry service. Their collective expertise includes software, computer architecture, performance assessment, applications using supercomputing, economics, and policy matters.

The committee did its work through its own expert deliberations and by soliciting input from key officials in its sponsoring agency (DOE) and numerous experts in both the United States and Japan, including government officials, academic researchers, supercomputer manufacturers, software vendors, supercomputer center managers, and application users of supercomputing systems (see Appendix B). In addition to meeting six times, the committee hosted a workshop attended by more than 20 scientists from a broad range of disciplines to explore the supercomputing needs and opportunities of key scientific domains in the coming decade and to discuss the supercomputing technologies that will facilitate supercomputer use in these domains. Many of the workshop participants provided white papers (see Appendix C for a list) expressing their views on computational challenges in supercomputing, which informed both the workshop and this report.

The committee also visited five DOE supercomputer centers and the National Security Agency’s (NSA’s) Supercomputer Center (see Appendix B). A subset of the committee received classified briefings from the Department of Energy on stockpile stewardship and from the NSA on signals intelligence that helped illuminate how these mission requirements drive supercomputing needs now and in the future. Given that a significant fraction of government funding of supercomputing is for classified national security programs, the committee believed such briefings were needed to ensure that its report would be useful for the entire supercomputing community. Having received the briefings, the committee believes that the needs of the classified supercomputing applications reinforce, but do not change, the committee’s findings and recommendations for the future of supercomputing. This unclassified report does not have a classified annex, nor is there a classified version.

To facilitate communication within the broader community, the committee hosted a town hall meeting at the annual 2003 Supercomputing

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
×

Conference in Phoenix, Arizona. In addition, a subset of the committee spent one week in Japan meeting with senior colleagues from the Japanese government, industry, and academia to discuss scientific, technical, and policy issues of mutual interest and to better understand both the similarities and the differences in how the two countries approach supercomputing. They visited several sites in Japan, including the Earth Simulator; the government ministry responsible for funding the Earth Simulator; a university supercomputer center; Japan’s Aerospace Exploration Agency; and an auto manufacturer. On the committee’s behalf, the National Academy of Engineering co-sponsored with the Engineering Academy of Japan a 1-day forum in Tokyo on the future of supercomputing. Twenty-five Japanese supercomputing experts participated in the forum. The sharing of ideas in those meetings provided important perspectives that contributed to the completeness and accuracy of this report. It is the hope of the committee that activities such as the Tokyo forum will lead to future collaboration between Japan and the United States in areas that will advance supercomputing in both countries.

In July 2003, the committee released an interim report2 that provided a high-level description of the state of U.S. supercomputing, the needs of the future, and the factors that contribute to meeting those needs. That report generated a number of comments that helped to guide the committee in its work for this final report. Additional inputs helpful to committee members and staff came from professional conferences, the technical literature, and government reports.

The committee is grateful to the many people who contributed to this complex study and its comprehensive report. First and foremost, the committee thanks the sponsors, DOE’s Office of Science (Fred Johnson and Dan Hitchcock) and DOE’s NNSA (Dimitri Kusnezov, Edgar Lewis, and José Muñoz), not only for their financial support but also for their help in facilitating meetings with people with whom its members wished to speak.

The committee appreciates the thoughtful testimony received from many individuals at its plenary sessions (see Appendix B for a complete list of briefers). The NSA and DOE site visits provided critical input to the committee deliberations. These site visits would not have been possible without the assistance of people at each locale. The committee and staff thank the following people for their help: Gary D. Hughes (NSA), Lynn Kissel (Lawrence Livermore National Laboratory), James S. Peery (Los Alamos National Laboratory),Horst D. Simon (Lawrence Berkeley Na-

2  

National Research Council (NRC). 2003. The Future of Supercomputing: An Interim Report. Washington, D.C.: The National Academies Press.

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
×

tional Laboratory), Robert Thomas (Sandia National Laboratories), Rick Stevens (Argonne National Laboratory), and Thomas Zacharia (Oak Ridge National Laboratory).

The committee thanks the workshop participants for the insights they contributed through their white papers (see Appendix C for a list of papers), discussions, breakout sessions, and subsequent interactions. The committee is particularly grateful to Warren Washington (National Center for Atmospheric Research), Charles McMillan (Lawrence Livermore National Laboratory), Jeffrey Saltzman (Merck Research Laboratory), and Phillip Colella (Lawrence Berkeley National Laboratory) for their thoughtful plenary presentations.

Many people were instrumental in making the trip to Japan a success. The committee is extremely grateful to Kenichi Miura (Fujitsu fellow) and Tadashi Watanabe (NEC) for their assistance before and during the trip. The 1-day Japan–U.S. Forum on the Future of Supercomputing would not have been possible without the support of the Engineering Academy of Japan and the National Academy of Engineering. The committee learned a lot from insightful presentations and discussions from all the Japanese forum participants. The committee and staff also thank the individuals at each site who took time to meet with the committee. In particular, they thank Tetsuya Sato at the Earth Simulator Center and Harumasa Miura at the Ministry of Education, Culture, Sports, Science, and Technology. Maki Haraga provided excellent translation services and logistical help for the committee’s entire trip.

The committee was fortunate to receive many thoughtful and perceptive comments from the reviewers as well as from the Monitor and the Coordinator of this report. These comments were instrumental in helping the committee to sharpen and improve its report.

Finally, the committee thanks the various members of the NRC staff who helped to move this report from vision to reality. Cynthia Patterson provided continuing wisdom, guidance, encouragement, and friendship, in concert with her hard work on the report. Margaret Huynh’s skills in organizing the committee’s meetings and supporting its efforts and Phil Hilliard’s research support were key contributions to the work of the committee. Liz Fikre edited the final manuscript for publication. Kevin Hale and Machelle Reynolds successfully facilitated the security clearances and security review necessary to complete this study in a timely manner. Janice Mehler and Liz Panos were very helpful in facilitating and expediting the review process.

Susan L. Graham and Marc Snir, Co-chairs

Committee on the Future of Supercomputing

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
×

Acknowledgment of Reviewers

This report has been reviewed in draft form by individuals chosen for their diverse perspectives and technical expertise, in accordance with procedures approved by the National Research Council’s (NRC’s) Report Review Committee. The purpose of this independent review is to provide candid and critical comments that will assist the institution in making the published report as sound as possible and to ensure that the report meets institutional standards for objectivity, evidence, and responsiveness to the study charge. The review comments and draft manuscript remain confidential to protect the integrity of the deliberative process. We wish to thank the following individuals for their review of this report:

Mark E. Dean, IBM,

Steven Gottlieb, Indiana University,

Shane Mitchell Greenstein, Northwestern University,

Sidney Karin, University of California, San Diego,

Ken Kennedy, Rice University,

Richard Loft, National Center for Atmospheric Research,

J. Andrew McCammon, University of California, San Diego,

Kenichi Miura, National Institute of Informatics,

Michael Norman, University of Illinois, Urbana-Champaign,

Richard Proto, National Security Agency (retired),

Daniel A. Reed, University of North Carolina, Chapel Hill,

Ahmed Sameh, Purdue University,

Gary Smaby, Smaby Group, Inc.,

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
×

Burton J. Smith, Cray Inc.,

Allan Edward Snavely, San Diego Supercomputing Center,

William W. Stead, Vanderbilt University, and

Paul Tackley, University of California, Los Angeles.

Although the reviewers listed above have provided many constructive comments and suggestions, they were not asked to endorse the conclusions or recommendations, nor did they see the final draft of the report before its release. The review of this report was overseen by Elsa Garmire of Dartmouth University and Samuel H. Fuller of Analog Devices, Inc. Appointed by the NRC, they were responsible for making certain that an independent examination of this report was carried out in accordance with institutional procedures and that all review comments were carefully considered. Responsibility for the final content of this report rests entirely with the authoring committee and the institution.

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Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
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4

 

THE DEMAND FOR SUPERCOMPUTING

 

67

   

 Compelling Applications for Supercomputing,

 

70

   

 Common Themes and Synergies Across Applications Areas,

 

72

   

 Selected Application Areas,

 

74

   

 Stockpile Stewardship,

 

74

   

 Signals Intelligence,

 

76

   

 Defense,

 

78

   

 Climate Modeling,

 

79

   

 Plasma Physics,

 

84

   

 Transportation,

 

85

   

 Bioinformatics and Computational Biology,

 

89

   

 Societal Health and Safety,

 

92

   

 Earthquakes,

 

93

   

 Geophysical Exploration and Geoscience,

 

94

   

 Astrophysics,

 

96

   

 Materials Science and Computational Nanotechnology,

 

97

   

 Human/Organizational Systems Studies,

 

100

   

 Projected Computing Needs for Applications,

 

101

5

 

TODAY’S SUPERCOMPUTING TECHNOLOGY

 

104

   

 Supercomputer Architecture,

 

105

   

 Scaling of Technology,

 

105

   

 Types of Supercomputers,

 

111

   

 Performance Issues,

 

113

   

 Trade-offs,

 

118

   

 Trends in Supercomputer Architecture,

 

121

   

 Supercomputing Algorithms,

 

125

   

 Solving Partial and Ordinary Differential Equations,

 

126

   

 Mesh Generation,

 

128

   

 Dense Linear Algebra,

 

129

   

 Sparse Linear Algebra,

 

129

   

 Discrete Algorithms,

 

130

   

 Fast Transforms,

 

131

   

 New Algorithmic Demands Arising from Supercomputing,

 

131

   

 Disciplinary Needs,

 

131

   

 Interdisciplinary Needs,

 

132

   

 Synthesis, Sensitivity Analysis, and Optimization Replacing Analysis,

 

133

   

 Huge Data Sets,

 

133

   

 Changing Machine Models,

 

133

   

 Supercomputing Software,

 

134

   

 Operating Systems and Management Software,

 

135

   

 Programming Models, Programming Languages, and Tools,

 

138

Suggested Citation:"Front Matter." National Research Council. 2005. Getting Up to Speed: The Future of Supercomputing. Washington, DC: The National Academies Press. doi: 10.17226/11148.
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 Libraries,

 

142

   

 Applications Software,

 

142

   

 Reliability and Fault Tolerance,

 

145

   

 Performance Estimation,

 

146

   

 Performance Benchmarks,

 

146

   

 Performance Monitoring,

 

148

   

 Performance Modeling and Simulation,

 

148

   

 Performance Estimation and the Procurement Process,

 

150

   

 The Imperative to Innovate and Barriers to Innovation,

 

151

   

 Systems Issues,

 

151

   

 Issues for Algorithms,

 

153

   

 An Example from Computational Fluid Dynamics,

 

154

   

 Software Issues,

 

155

6

 

SUPERCOMPUTING INFRASTRUCTURES AND INSTITUTIONS

 

157

   

 Supercomputing Ecosystem Creation and Maintenance,

 

161

   

 How Ecosystems Get Established,

 

162

   

 Potential Barriers for New Ecosystems,

 

166

   

 Ecosystem Workforce,

 

170

   

 Consumer Institutions,

 

174

   

 Supercomputing Centers,

 

174

   

 Industrial Supercomputing,

 

176

7

 

SUPERCOMPUTING ABROAD

 

180

   

 Japan,

 

182

   

 Similarities,

 

182

   

 Differences,

 

183

   

 The Earth Simulator,

 

183

   

 Other Japanese Centers,

 

187

   

 China,

 

188

   

 Europe,

 

189

   

 United Kingdom,

 

189

   

 Germany,

 

190

   

 France,

 

190

   

 Spain,

 

191

   

 Application Software,

 

191

8

 

A POLICY FRAMEWORK

 

192

   

 The Government as the Leading User and Purchaser of Supercomputer Technology,

 

193

   

 Supercomputer Technology Investments as Public Goods,

 

194

   

 Potential Costs of Government Intervention,

 

195

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Supercomputers play a significant and growing role in a variety of areas important to the nation. They are used to address challenging science and technology problems. In recent years, however, progress in supercomputing in the United States has slowed. The development of the Earth Simulator supercomputer by Japan that the United States could lose its competitive advantage and, more importantly, the national competence needed to achieve national goals. In the wake of this development, the Department of Energy asked the NRC to assess the state of U.S. supercomputing capabilities and relevant R&D. Subsequently, the Senate directed DOE in S. Rpt. 107-220 to ask the NRC to evaluate the Advanced Simulation and Computing program of the National Nuclear Security Administration at DOE in light of the development of the Earth Simulator. This report provides an assessment of the current status of supercomputing in the United States including a review of current demand and technology, infrastructure and institutions, and international activities. The report also presents a number of recommendations to enable the United States to meet current and future needs for capability supercomputers.

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