Lattice Quantum Chromo Dynamics (QCD) and the Dedicated Computer QCDPAX
Lattice QCD (Quantum ChromoDynamics) is believed to be the fundamental law for quarks and gluons, which constitute particles such as protons, neutrons, and pions. QCDPAX is a local memory MIMD parallel computer designed for simulations in lattice QCD. Processing units (PU’s) are connected in a toroidal two-dimensional nearest-neighbor mesh. We have completed construction of the computer made of 240 PU’s (7 GFLOPS peak speed) and we will complete construction of the final QCDPAX made of 480 PU’s (14 GFLOPS peak speed) by the spring of 1990. The program is written in terms of a C-like language, psc (parallel scientific C), and the tuning is possible at an assembly language, qfa (quick floating assembler), developed for the purpose of optimizing the object code. The link update time is evaluated.
KeywordsQuantum Chromo Dynamics Direct Memory Access Assembly Language Communication Memory Lattice Quantum Chromo Dynamics
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