Parallelizing QCD with dynamical fermions on a CRAY multiprocessor system

doi:10.1016/0167-8191(90)90028-8

Parallel Computing

Volume 15, Issues 1–3, September 1990, Pages 3-20

https://doi.org/10.1016/0167-8191(90)90028-8 Get rights and content

Abstract

Quantum Chromodynamics, the theory of the nuclear forces, is simulated on a space-time lattice by means of a Hybrid Monte Carlo algorithm which incorporates dynamical quarks exactly. The large computational needs of the program necessitate to use modern supercomputers like the CRAY Y-MP that achieve their high computing speed by using both vector and parallel hardware. This paper gives a short introduction into the CRAY Y-MP system architecture and the autotasking concept which offers a way for finding automatically parallelism in existing FORTRAN programs. In detail, the paper describes the application as well as the optimization and transformation process which had to be done to improve the performance. After some code modifications a speedup of nearly 7 on a CRAY Y-MP8/832 could be achieved, leading to a performance of about 1.65 GFLOPS.

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Cited by (4)

The hadron spectrum in QCD with dynamical staggered fermions
1993, Nuclear Physics, Section B
The hadron spectrum has been calculated in a large scale simulation of QCD with dynamical staggered fermions on a 16³ × 24 lattice at m = 0.01 and β = 5.35 and 5.15. Special emphasis is placed on flavour symmetry restoration, for which we observe a substantial improvement between the two β-values. The results at the lower β-value provide a scale for the critical temperature on an eight time slice lattice. In addition to the spectrum we investigate chiral properties and calculate the chiral condensate and ƒ_π in the chiral limit.
Hadron masses from the MT<inf>c</inf> collaboration
1991, Nuclear Physics B (Proceedings Supplements)
Preliminary results of the MT_c collaboration on the hadron spectrum in full QCD with four flavors of staggered fermions are presented. The calculation is being carried out on a 16³ × 24 lattice at β = 5.15 and 5.35 for a quark mass ma = 0.01, using a Hybrid Monte Carlo algorithm. Some emphasis is put on the investigation of flavor symmetry restoration. The results are compared with a quenched analysis at β values between 5.7 and 6.0, a range where the lattice spacing roughly corresponds to the unquenched simulation.
Lattice quantum hadrodynamics on a CRAY Y-MP
1992, The Journal of Supercomputing
Evaluating the basic performance of the Intel iPSC/860 parallel computer
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Practical aspect and experienceParallelizing QCD with dynamical fermions on a CRAY multiprocessor system

Abstract

Langevin simulations of lattice field theories

Phys. Rev.

Monte Carlo Method in Statistical Physics

Memory performance of CRAY X-MP and CRAY Y-MP

Hybrid Monte Carlo

Phys. Lett.

Quantum Mechanics and Path Integrals

Parallel processing at CRAY research

Hybrid-molecular-dynamics algorithms for the numerical solution of quantum chromodynamics

Phys. Rev.

Practical aspect and experience
Parallelizing QCD with dynamical fermions on a CRAY multiprocessor system