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We define and implement one member of a family of causal memories that we have developed. Causal memories are weakly consistent and admit more executions, hence allowing more concurrency, than either atomic or sequentially consistent memories. Informally, causal memories require the apparent order of writes to respect a shared memory analog of Lamport's potential causality. In this paper we: motivate...
The Collaborative Computing Transport Layer (CCTL) is a communication substrate consisting of a suite of group communication protocols. The design of CCTL supports the needs of distributed collaborative applications. CCTL is based on a two-level group hierarchy that naturally matches the structure of many collaborative applications and that allows several implementation optimizations. Logical interconnections...
Summary.The abstraction of a shared memory is of growing importance in distributed computing systems. Traditional memory consistency ensures that all processes agree on a common order of all operations on memory. Unfortunately, providing these guarantees entails access latencies that prevent scaling to large systems. This paper weakens such guarantees by defining causal memory, an abstraction that...
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