Rollback and Recovery Strategies for Computer Programs

摘要: Reliability is an important aspect of any system. On-line diagnosis, parity check coding, triple modular redundancy, and other methods have been used to improve the reliability computing systems. In this paper another reliable systems explored. The problem that recovering error-free information when error detected at some stage in processing a program. If or fault while program being processed if it cannot be corrected immediately, may necessary run entire again. time spent rerunning substantial real applications critical. Recovery can reduced by saving states (all stored registers, primary secondary storage, etc.) intervals, as continues. restarted from its most recently saved state. However, price paid state form storing all relevant storage. Hence expensive save too often. Not cause unacceptably large recovery time. we solve following. Determine optimum points which should recover after malfunction.