Mechanisms for Cooperative Shared Memory (1993)
| Citations: | 33 - 17 self |
BibTeX
@MISC{Wood93mechanismsfor,
author = {David Wood and Satish Ch and Babak Falsafi and Mark D. Hill and James R. Larus and Alvin R. Lebeck and James C. Lewis and Shubhendu S. Mukherjee and Subbarao Palacharla and Steven K. Reinhardt},
title = {Mechanisms for Cooperative Shared Memory},
year = {1993}
}
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Abstract
This paper explores the complexity of implementing directory protocols by examining their mechanisms--- primitive operations on directories, caches, and network interfaces. We compare the following protocols: Dir 1 B, Dir 4 B, Dir 4 NB, Dirn NB [2], Dir 1 SW [9] and an improved version of Dir 1 SW (Dir 1 SW + ). The comparison shows that the mechanisms and mechanism sequencing of Dir 1 SW and Dir 1 SW + are simpler than those for other protocols. We also compare protocol performance by running eight benchmarks on 32 processor systems. Simulations show that Dir 1 SW + 's performance is comparable to more complex directory protocols. The significant disparity in hardware complexity and the small difference in performance argue that Dir 1 SW + may be a more effective use of resources. The small performance difference is attributable to two factors: the low degree of sharing in the benchmarks and CheckIn /Check-Out (CICO) directives [9]. Keywords: Shared-memory multiprocessors, ...
