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Manuscript Title: Efficient multitasking of the SU(3) lattice gauge theory algorithm on
the CRAY X-MP. | ||

Authors: D.W. Kuba, K.J.M. Moriarty | ||

Program title: SU3 | ||

Catalogue identifier: AABT_v1_0Distribution format: gz | ||

Journal reference: Comput. Phys. Commun. 36(1985)351 | ||

Programming language: Fortran. | ||

Computer: CRAY X-MP-4 (MODEL 48). | ||

Operating system: COS (VERSION X.15). | ||

RAM: 2700K words | ||

Word size: 64 | ||

Keywords: Particle physics, Elementary, Quantum chromodynamics, Lattice gauge theory, Su(3) gauge theory, Monte carlo methods, Vector processors, Multitasking. | ||

Classification: 11.5. | ||

Nature of problem:The Monte Carlo lattice gauge theory algorithm with the metropolis et al. Updating procedure is vectorized and multitasked on the four processor CRAY X-MP and results in a code with a link-update-time, in 64-bit arithmetic and 10 hits-per-link, of 11.0 musec on a 16**4 lattice, the fastest link-update-time so far achieved. The program calculates the Wilson loops of size up to L/2 x L/2 for an L**4 lattice for SU(3) gauge theory. The formulation of a gauge theory on a lattice was proposed by Wilson to regulate the divergences of quantum field theory. | ||

Solution method:SU(3) gauage theory is simulated on a hypercubical lattice by Monte Carlo methods on a multitasking vector processor, the CRAY X-MP-4. | ||

Restrictions:For a lattice of L sites in each of the space-time directions we need storage for 4L**4 SU(3) matrices, or 4L**4 *18 real variables. This is the only restriction on the program. | ||

Running time:The test run on a 16**4 lattice for SU(3) with 40 Monte Carlo iterations calculating all Wilson loops up to size 8*8 took 156.9 s for execution on the CRAY X-MP-4. |

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