Software Survival Time for Di erent
نویسنده
چکیده
This paper provides experimental and theoretical evidence for the existence of contiguous failure regions in the program input space (`blob' defects). For real-time systems where successive input values tend to be similar, blob defects can have a major impact on the software survival time because the failure probability is not constant. For example, with a `random walk' input sequence, the probability of failure decreases as the time from the last failure increases. It is shown that the key factors aaecting the survival time are the input`trajec-tory', the rate of change of the input values and thèsurface area' of the defect (rather than its volume).
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