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<p>The authors demonstrate the need to address fault latency in highly reliable real-time control computer systems. It is noted that the effectiveness of all known recovery mechanisms is greatly reduced in the presence of multiple latent faults. The presence of multiple latent faults increases the possibility of multiple errors, which could result in coverage failure. The authors present experimental evidence indicating that the duration of fault latency is dependent on workload. A synthetic work generator is used to vary the workload, and a hardware fault injector is applied to inject transient faults of varying durations. This method makes it possible to derive the distribution of fault latency duration. Experimental results obtained from the fault-tolerant multiprocessor at the NASA Airlab are presented and discussed.</p>
workload effects; fault latency; real-time systems; control computer systems; recovery mechanisms; multiple latent faults; coverage failure; synthetic work generator; hardware fault injector; fault-tolerant multiprocessor; NASA Airlab; control systems; fault tolerant computing; multiprocessing systems; program testing; real-time systems; software engineering; system recovery.

K. Shin and M. Woodbury, "Measurement and Analysis of Workload Effects on Fault Latency in Real-Time Systems," in IEEE Transactions on Software Engineering, vol. 16, no. , pp. 212-216, 1990.
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