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An efficient tree cache coherence protocol for distributed shared memory multiprocessors

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2 Author(s)
Yeimkuan Chang ; Dept. of Inf. Manage., Chung-Hua Univ., Taiwan ; L. N. Bhuyan

Directory schemes have long been used to solve the cache coherence problem for large scale shared memory multiprocessors. In addition, tree-based protocols have been employed to reduce the directory size and the invalidation latency for a large degree of data sharing in the system. However, the existing tree-based protocols involve a very high communication overhead for maintaining a balanced tree, especially when the degree of data sharing is low. This paper presents a new tree-based cache coherence protocol which is a hybrid of the limited directory and the linked list schemes. By utilizing a limited number of pointers in the directory, the proposed protocol connects the nodes caching a shared block in a tree fashion without incurring any communication overhead. In addition to the low communication overhead, the proposed scheme also possesses the advantages of the existing bit-map and tree-based linked list protocols, namely, scalable memory requirement and logarithmic invalidation latency. We evaluate the performance of our protocol by running four applications on the Proteus execution-driven simulator. Our simulation results show that the performance of the proposed protocol is very close to that of the full-map protocol

Published in:

IEEE Transactions on Computers  (Volume:48 ,  Issue: 3 )