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Concurrent system-level error detection techniques using a watchdog processor are surveyed. A watchdog processor is a small and simple coprocessor that detects errors by monitoring the behavior of a system. Like replication, it does not depend on any fault model for error detection. However, it requires less hardware than replication. It is shown that a large number of errors can be detected by
concurrent error detection; system behaviour monitoring; assertion execution; fault tolerant computing; watchdog processors; system-level error detection; coprocessor; control-flow checking; memory-access checking; capability-based addressing; reasonable checks; automatic testing; computer architecture; computer testing; computerised monitoring; error detection; fault tolerant computing; reviews; satellite computers; special purpose computers.

E. McCluskey and A. Mahmood, "Concurrent Error Detection Using Watchdog Processors-A Survey," in IEEE Transactions on Computers, vol. 37, no. , pp. 160-174, 1988.
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