Abstract
This chapter describes the QCD machine, a special-purpose parallel supercomputer that was designed and built to solve the lattice QCD problem that arises in particle physics. The chapter presents the architecture of the QCD Machine and relates important features of its design to properties of the problem that it was built to solve. The issues involved in programming the computer are discussed. The chapter also presents measurements of the computer's performance and its construction history. The central activities within the discipline of high-energy physics are the discovery of the basic constituents of matter and the description of the interactions between them. As with the simulation of most continuous systems, the numerical analysis of QCD begins with the formulation of a discrete version of the theory. As the calculations intrinsically involve time and space, the lattice version of QCD is denned on a four-dimensional grid. However, unlike other continuum simulations, the degrees of freedom are associated with the edges of the grid and with the vertices.
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