ECE SEMINAR: Automatic Generation of Highly Concurrent, Hierarchical and Heterogeneous Cache Coherence Protocols from Atomic Specifications

Feb 17

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Friday, February 17, 2023 – 4:00PM to 5:00PM

Dr. Oswald


Dr. Nicolai Oswald

Cache coherence protocols are often specified using only stable states and atomic transactions for a single cache hierarchy level. Designing highly concurrent, hierarchical and heterogeneous directory cache coherence protocols from these atomic specifications for modern multicore architectures is a complicated task.
To overcome these design challenges, we have developed the novel *Gen algorithms (ProtoGen, HieraGen and HeteroGen). Using the *Gen algorithms highly-concurrent, hierarchical and heterogeneous cache coherence protocols can be automatically generated for a wide range of atomic input stable state protocol (SSP) specifications - including the MOESI variants, as well as for protocols that are targeted towards Total Store Order and Release Consistency. The generated controllers are then automatically verified using the Murϕ/Rumur model checkers for safety, deadlock freedom and memory consistency model conformity using litmus tests. Our experiments show that the generated protocols show identical or better performance than manually generated ones. For each *Gen algorithm we have developed and published an eponymous tool.