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 , Dir n 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 Check- In/Check-Out (CICO) directives [9].
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