Vectorization on Monte Carlo particle transport: an architectural study using the LANL benchmark “GAMTEB”

Authors:
P. J. Burns;M. Christon;R. Schweitzer;O. M. Lubeck;H. J. Wasserman
Affiliations:
Colorado State University, Dept. of Mech. Engr. and Univ. Computer Center, Fort Collins, CO;Colorado State University, Dept. of Mech. Engr. and Univ. Computer Center, Fort Collins, CO;Colorado State University, Dept. of Mech. Engr. and Univ. Computer Center, Fort Collins, CO;Computing and Communications Division, Los Alamos National Laboratory, Los Alamos, NM;Computing and Communications Division, Los Alamos National Laboratory, Los Alamos, NM
Venue:
Proceedings of the 1989 ACM/IEEE conference on Supercomputing
Year:
1989

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Abstract

Fully vectorized versions of the Los Alamos National Laboratory benchmark code Gamteb, a Monte Carlo photon transport algorithm, were developed for the Cyber 205/ETA-10 and Cray X-MP/Y-MP architectures. Single-processor performance measurements of the vector and scalar implementations were modeled in a modified Amdahl's Law that accounts for additional data motion in the vector code. The performance and implementation strategy of the vector codes are related to architectural features of each machine. Speedups between fifteen and eighteen for Cyber 205/ETA-10 architectures, and about nine for CRAY X-MP/Y-MP architectures are observed. The best single processor execution time for the problem was 0.33 seconds on the ETA-10G, and 0.42 seconds on the CRAY Y-MP.