@inproceedings{9587c903b07a46b2aac2ceeae0cfe0e7,
title = "Registers size influence on vector architectures",
abstract = "In this work we studied the influence of the vector register size over two different concepts of vector architectures. Long vector registers play an important role in a conventional vector architecture, however, even using highly vectorisable codes, only a small fraction of that large vector registers is used. Reducing vector register size on a conventional vector architecture results in a severe performance degradation, providing slowdowns in the range of 1.8 to 3.8. When we included an out-of-order execution on a vector architecture, the need for long vector registers was reduced. We used a trace driven approach to simulate a selection of the Perfect Club and Specfp92 programs. The results of the simulations showed that the reduction of the register size on an out-of order vector architecture led to slowdowns in the range of 1.04 to 1.9. These compare favourably with the values found for a conventional vector machine. Even when reducing the registers size to 1/4 of the original size on an out-of-order machine, the slowdown was between 1.04 and 1.5, and was better still than on a conventional vector machine. Finally, when comparing both architectures, using the same register file size (8kb) we found that the gains in performance using out-of-order execution were between 1.13 and 1.40.",
author = "Luis Villa and Roger Espasa and Mateo Valero",
note = "Publisher Copyright: {\textcopyright} Springer-Verlag Berlin Heidelberg 1999.; 3rd International Meeting on Vector and Parallel Processing, VECPAR 1998 ; Conference date: 21-06-1998 Through 23-06-1998",
year = "1999",
doi = "10.1007/10703040_33",
language = "Ingl{\'e}s",
isbn = "3540662286",
series = "Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)",
publisher = "Springer Verlag",
pages = "439--451",
editor = "Dongarra, {Jack J.} and Palma, {Jos{\'e} M.L.M.} and Dongarra, {Jack J.} and Vicente Hern{\'a}ndez",
booktitle = "Vector and Parallel Processing – VECPAR 1998 - 3rd International Conference, Selected Papers and Invited Talks",
address = "Alemania",
}