Overview of the QCDSP and QCDOC computers

Authors:
P. A. Boyle;D. Chen;N. H. Christ;M. A. Clark;S. D. Cohen;C. Cristian;Z. Dong;A. Gara;B. Joo;C. Jung;C. Kim;L. A. Levkova;X. Liao;G. Liu;R. D. Mawhinney;S. Ohta;K. Petrov;T. Wettig;A. Yamaguchi
Affiliations:
School of Physics, University of Edinburgh, Edinburgh, Scotland, UK;IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York;Department of Physics, Columbia University, New York, New York;School of Physics, University of Edinburgh, Edinburgh, Scotland, UK;Department of Physics, Columbia University, New York, New York;US Equity Derivatives, New York, New York;Department of Physics, Columbia University, New York, New York;IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York;School of Physics, University of Edinburgh, Edinburgh, Scotland, UK;Brookhaven National Laboratory, Upton, New York;Department of Physics, Columbia University, New York, New York;Indiana University, Bloomington, Indiana;UBS Investment Bank, Stamford, Connecticut;Gluon Capital LLC, New York, New York;Department of Physics, Columbia University, New York, New York;Institute of Particle and Nuclear Studies, The High Energy Accelerator Research Organization, Tsukuba, Ibaraki, Japan;Brookhaven National Laboratory, Upton, New York;Institute for Theoretical Physics, University of Regensburg, Regensburg, Germany;Department of Physics and Astronomy, University of Glasgow, Glasgow, Scotland, UK
Venue:
IBM Journal of Research and Development
Year:
2005

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Abstract

The QCDSP and QCDOC computers are two generations of multithousand-node multidimensional mesh-based computers designed to study quantum chromodynamics (QCD), the theory of the strong nuclear force. QCDSP (QCD on digital signal processors), a four-dimensional mesh machine, was completed in 1998; in that year, it won the Gordon Bell Prize in the price/performance category. Two large installations--of 8,192 and 12,288 nodes, with a combined peak speed of one teraflops--have been in operation since. QCD-on-a-chip (QCDOC) utilizes a sixdimensional mesh and compute nodes fabricated with IBM systemon-a-chip technology. It offers a tenfold improvement in price/ performance. Currently, 100-node versions are operating, and there are plans to build three 12,288-node, 10-teraflops machines. In this paper, we describe the architecture of both the QCDSP and QCDOC machines, the operating systems employed, the user software environment, and the performance of our application-- lattice QCD.