QCDOC: A 10 Teraflops Computer for Tightly-Coupled Calculations

Authors:
P. A. Boyle;Dong Chen;Norman H. Christ;Mike Clark;Saul Cohen;Zhihua Dong;Alan Gara;Balint Joo;Chulwoo Jung;Ludmila Levkova;Xiaodong Liao;Guofeng Liu;Robert D. Mawhinney;Shigemi Ohta;Konstantin Petrov;Tilo Wettig;Azusa Yamaguchi;Calin Cristian
Affiliations:
University of Edinburgh and Columbia University;IBM T.J. Watson Research Laboratory;Columbia University;University of Edinburgh and Columbia University;Columbia University;Columbia University;IBM T.J. Watson Research Laboratory;University of Edinburgh;Brookhaven National Lab and Columbia University;Columbia University;Columbia University;Columbia University;Columbia University;KEK Japan, RBRC and Brookhaven National Lab;Brookhaven National Lab and Columbia University;University of Regensburg;Columbia University;Columbia University
Venue:
Proceedings of the 2004 ACM/IEEE conference on Supercomputing
Year:
2004

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Abstract

Numerical simulations of the strong nuclear force, known as quantum chromodynamics or QCD, have proven to be a demanding, forefront problem in high-performance computing. In this report, we describe a new computer, QCDOC (QCD On a Chip), designed for optimal price/performance in the study of QCD. QCDOC uses a six-dimensional, low-latency mesh network to connect processing nodes, each of which includes a single custom ASIC, designed by our collaboration and built by IBM, plus DDR SDRAM. Each node has a peak speed of 1Gigaflops and two 12,288node, 10+ Teraflops machines are to be completed in the fall of 2004. Currently, a 512 node machine is running, delivering efficiencies as high as 45% of peak on the conjugate gradient solvers that dominate our calculations and a 4096-node machine with a cost of $1.6M is under construction. This should give us a price/performance less than $1per sustained Megaflops.