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Manuscript Title: Vectorization of the three-dimensional Ising model program on the CDC CYBER 205.
Authors: M. Creutz, K.J.M. Moriarty, M. O'Brien
Program title: ISING
Catalogue identifier: AADW_v2_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 42(1986)191
Programming language: Fortran.
Computer: CDC CYBER 205 (MOD 682).
Operating system: CDS CYBER 200 VSOS 2.1.6.
RAM: 110K words
Word size: 64
Keywords: Statistical physics, Thermodynamics, Solid state physics, Ising model, Phase transitions, Critical exponents, Correlation functions, Magnetization, Microcanonical methods, Vector processors, Vectorization methods.
Classification: 7.7, 23.

Nature of problem:
Equilibrium configurations of the elementary magnets in the three- dimensional Ising model are generated thus allowing the calculation of the critical exponents.

Solution method:
A previously published FORTRAN program(Comp. Phys. Commun. 39(1986),173) for the three-dimensional Ising model using the microcanonical method is vectorized on the CDC CYBER 205 vector processor and an updating rate of 116M spins/sec is obtained.

Restrictions:
The only possible restriction on the program is the run time which has to be considerable in order to reduce the errors in the measurements of the critical exponents. The storage requirements for the program, which are IX*IY*IWIDE, are not severe and cause no problems on today's supercomputers.

Running time:
The test run on a 129*128*384 lattice with ten sweeps through the lattice took 7.6 sec on the 8Mword, 2 vector pipeline CDC CYBER 205 at Rockville, Maryland.