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Unpredictability in COTS-based systems often manifests as occasional instances of uncontrollably-high response times. A particular category of COTS systems, Fault-Tolerant (FT) middleware, is used in critical enterprise and embedded applications where predictability is of paramount importance. The prior empirical study, which used a client-server micro benchmark, suggested that hard bounds for the maximum latency are hard to establish a priori, but that the unpredictability may be confined to less than 1% of the requests.
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