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Current technology trends make it possible to build communication networks that can support high-performance distributed computing. This paper describes issues in the design of a prototype switch for an arbitrary topology point-to-point network with link speeds of up to 1 Gbit/s. The switch deals in fixed-length ATM-style cells, which it can process at a(More)
A language for parallel programming, with a primitive construct for synchronization and mutual exclusion, is presented. Hoare's deductive system for proving partial correctness of sequential programs is extended to include the parallelism described by the language. The proof method lends insight into how one should understand and present parallel programs.(More)
An axiomatic method for proving a number of properties of parallel programs is presented. Hoare has given a set of axioms for partial correctness, but they are not strong enough in most cases. This paper defines a more powerful deductive system which is in some sense complete for partial correctness. A crucial axiom provides for the use of auxiliary(More)
Competitive analysis is concerned with comparing the performance of on-line algorithms with that of optimal off-line algorithms. In some cases randomization can lead to algorithms with improved performance ratios on worst-case sequences. In this paper we present new randomized on-line algorithms for snoopy caching and the spin-block problem. These(More)
A liveness property asserts that program execution eventually reaches some desirable state. While termination has been studied extensively, many other liveness properties are important for concurrent programs. A formal proof method, based on temporal logic, for deriving liveness properties is presented. It allows a rigorous formulation of simple informal(More)
The charter of SRC is to advance both the state of knowledge and the state of the art in computer systems. From our establishment in 1984, we h a v e performed basic and applied research to support Digital's business objectives. Our current w ork includes exploring distributed personal computing on multiple platforms, networking, programming technology,(More)
DEC's business and technology objectives require a strong research program. The Systems Research Center (SRC) and three other research laboratories are committed to lling that need. SRC began recruiting its rst research scientists in l984|their charter, to advance the state of knowledge in all aspects of computer systems research. Our current w ork includes(More)
A model and a sound and complete proof system for networks of processes in which component processes communicate exclusively through messages is given. The model, an extension of the trace model, can describe both synchronous and asynchronous networks. The proof system uses temporal-logic assertions on sequences of observations — a generalization of(More)