A rollback interval for networks with an imperfect self-checking property
[摘要] Dynamic self-checking is a technique used in computers to detect a fault quickly before extensive data contamination caused by the fault can occur. When the self-checking properties of the computer circuits are not perfect, as in the case with self-testing only and partially self-checking circuits, the recovery procedure may be required to roll back program execution to a point prior to the first undetected data error caused by the detected fault. This paper presents a method by which the rollback distance required to achieve a given probability of successful data restoration may be calculated. To facilitate this method, operational interpretations are given to familiar network properties such as the self-testing, secureness, and self-checking properties. An arithmetic and logic unit with imperfect self-checking capability is analyzed to determine the minimum required rollback distance for the recovery procedure.
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[效力级别] [学科分类] 计算机科学(综合)
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