A program may not terminate its execution due to failures that can cause the program to have to be restarted. Castillo and Siewiorek (1980) proposed a model of a computing system considering such performance measures...
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A program may not terminate its execution due to failures that can cause the program to have to be restarted. Castillo and Siewiorek (1980) proposed a model of a computing system considering such performance measures as the apparent capacity and the expected elapsed time required to execute a given program correctly. The analyzed scheme of program execution requires that a fresh run be started after the error. program checkpointing can be used to decrease the overhead caused by restarts. Checkpointing allows the program to be resumed from the earlier point in its execution and not from the beginning. Brock (1979) analyzed and estimated the expected execution time of programs both with and without checkpointing. The distribution and the expectation of the elapsed time are derived here under the assumption of program checkpointing. The optimum interval between checkpoints is considered, and the performance of the program with and without checkpointing is compared. Appendices.
This study analyzes the relationship between program performance and workload levels. The results indicate that program effectiveness is highest under medium workloads while efficiency is greatest under high workloads...
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This study analyzes the relationship between program performance and workload levels. The results indicate that program effectiveness is highest under medium workloads while efficiency is greatest under high workloads. The management dilemma resulting from these findings is discussed.
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