Accession Number : ADA134467

Title :   A Real-Time Systems Symposium Preprint.

Descriptive Note : Interim technical rept.


Full Text :

Report Date : Sep 1983

Pagination or Media Count : 15

Abstract : This paper describes the measurement and analysis of permanent CPU (Central Processing Unit) related errors and system activity at the Stanford Linear Accelerator Center computation facility. Between 13 and 18 percent of all errors affecting the CPU were estimated to be permanent. The manifestation of a permanent error was found to be strongly correlated with the level and type of workload prior to the manifestation of the error, for example, it is shown that the risk of a permanent error increases in a non-linear fashion with the amount of interactive processing. The observed tendency is present in three years of load data. This observation is significant because of load-error relationship found at the CPU level must, in our view, be considered fundamental. In addition, in a majority of the observed errors, the latency between the occurence and the manifestation of the error was estimated to be insignificant for the purposes of our analysis. Thus the detection of the error also provides an estimate of the occurence of the error. (Author)

Descriptors :   *Error analysis , *Systems analysis , *Central processing units , Real time , Failure(Electronics) , Sensitivity , Data processing , Workload , Variables , Mathematical models

Subject Categories : Numerical Mathematics
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE