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Cache coherence scalability is a big challenge in shared memory systems.Traditional protocols do not scale due to the storage and traffic overhead ofcache invalidation. Tardis, a recently proposed coherence protocol, removescache invalidation using logical timestamps and achieves excellent scalability.The original Tardis protocol, however, only supports the Sequential Consistency(SC) memory model, limiting its applicability. Tardis also incurs extra networktraffic on some benchmarks due to renew messages, and has suboptimalperformance when the program uses spinning to communicate between threads.  In this paper, we address these downsides of Tardis protocol and make itsignificantly more practical. Specifically, we discuss the architectural,memory system and protocol changes required in order to implement the TSOconsistency model on Tardis, and prove that the modified protocol satisfiesTSO. We also describe modifications for Partial Store Order (PSO) and ReleaseConsistency (RC). Finally, we propose optimizations for better leasing policiesand to handle program spinning. On a set of benchmarks, optimized Tardisimproves on a full-map directory protocol in the metrics of performance,storage and network traffic, while being simpler to implement.

Tardis 2.0: Optimized Time Traveling Coherence for Relaxed Consistency Models