PPoPP 2016
Sat 12 - Wed 16 March 2016 Barcelona, Spain
Wed 16 Mar 2016 10:50 - 11:15 at Mallorca+Menorca - Consistency models Chair(s): James Larus

In distributed systems where strong consistency is costly when not impossible, causal consistency provides a valuable abstraction to represent program executions as partial orders. In addition to the sequential program order of each computing entity, causal order also contains the semantic links between the events that affect the shared objects – messages emission and reception in a communication channel, reads and writes on a shared register. Usual approaches based on semantic links are very difficult to adapt to other data types such as queues or counters because they require a specific analysis of causal dependencies for each data type. This paper presents a new approach to define causal consistency for any abstract data type based on sequential specifications. It explores, formalizes and studies the differences between three variations of causal consistency and highlights them in the light of PRAM, eventual consistency and sequential consistency: weak causal consistency, that captures the notion of causality preservation when focusing on convergence; causal convergence that mixes weak causal consistency and convergence; and causal consistency, that coincides with causal memory when applied to shared memory.

Wed 16 Mar
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10:00 - 11:15: Main conference - Consistency models at Mallorca+Menorca
Chair(s): James LarusEPFL
PPoPP-2016-papers10:00 - 10:25
Carl RitsonUniversity of Kent, Scott OwensUniversity of Kent
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PPoPP-2016-papers10:25 - 10:50
Ganesh NarayanswamyDepartment of Computer Science, University of Oxford, Saurabh JoshiDepartment of Computer Science and Engineering, IIT Guwahati, Daniel KroeningUniversity of Oxford
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PPoPP-2016-papers10:50 - 11:15
Matthieu PerrinUniversity of Nantes, Achour MostefaouiUniversity of Nantes, Claude JardUniversity of Nantes
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