chapter  12
46 Pages

LATENCY-CONSTRAINED RESYNCHRONIZATION

Chapter 11 introduced the concept of resynchronization, a post-optimization for static multiprocessor schedules in which extraneous synchronization operations are introduced in such a way that the number of original synchronizations that consequently become redundant significantly exceeds the number of additional synchronizations. Redundant synchronizations are synchronization operations whose corresponding sequencing requirements are enforced completely by other synchronizations in the system. The amount of run-time overhead required for synchronization can be reduced significantly by eliminating redundant synchronizations [Sha89, BSL97]. Thus, effective resynchronization reduces the net synchronization overhead in the implementation of a multiprocessor schedule, and improves the overall throughput.