Report Number: CSL-TR-93-588
Institution: Stanford University, Computer Systems Laboratory
Title: Update-Based Cache Coherence Protocols for Scalable
Author: Glasco, David B.
Author: Delagi, Bruce A.
Author: Flynn, Michael J.
Date: November 1993
Abstract: In this paper, two hardware-controlled update-based cache
coherence protocols are presented. The paper discusses the
two major disadvantages of the update protocols: inefficiency
of updates and the mismatch between the granularity of
synchronization and the data transfer. The paper presents two
enhancements to the update-based protocols, a write combining
scheme and a finer grain synchronization, to overcome these
disadvantages. The results demonstrate the effectiveness of
these enhancements that, when used together, allow the
update-based protocols to significantly improve the execution
time of a set of scientific applications when compared to
three invalidate-based protocols.