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Synchronizing clocks in the presence of faults

1985; Association for Computing Machinery; Volume: 32; Issue: 1 Linguagem: Inglês

10.1145/2455.2457

1557-735X

Leslie Lamport, P. M. Melliar‐Smith,

Interconnection Networks and Systems

Algorithms are described for maintaining clock synchrony in a distributed multiprocess system where each process has its own clock. These algorithms work in the presence of arbitrary clock or process failures, including “two-faced clocks” that present different values to different processes. Two of the algorithms require that fewer than one-third of the processes be faulty. A third algorithm works if fewer than half the processes are faulty, but requires digital signatures.