David Chaiken, John Kubiatowicz, Anant Agarwal. LimitLESS Directories: A Scalable Cache Coherence Scheme. Proceedings of the Fourth International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS IV), pages 224-234, April 1991.
(pdf, compressed postscript)


Caches enhance the performance of multiprocessors by reducing network traffic and average memory access latency. However, cache-based systems must address the problem of cache coherence. We propose the LimitLESS directory protocol to solve this problem. The LimitLESS scheme uses a combination of hardware and software techniques to realize the performance of a full-map directory with the memory overhead of a limited directory. This protocol is supported by Alewife, a large-scale multiprocessor. We describe the architectural interfaces needed to implement the LimitLESS directory, and evaluate its performance through simulations of the Alewife machine.

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