Accession Number : AD0669686

Title :   PROGRAM BEHAVIOR AND CONTROL IN VIRTUAL STORAGE COMPUTER SYSTEMS.

Descriptive Note : Technical rept.,

Corporate Author : MICHIGAN UNIV ANN ARBOR

Personal Author(s) : Pinkerton,Tad Brian

Report Date : APR 1968

Pagination or Media Count : 171

Abstract : This study attempts to resolve some problems in the allocation of storage to computer programs. In both large and small systems, it is necessary to periodically transfer parts of programs between main and auxiliary storage devices. Several stochastic models are used to represent the behavior of programs with respect to their use of storage. These models are used to suggest ways in which main storage should be allocated in order to maximize the efficiency of the operating system. Both packaging the parts of a program into memory units and scheduling the storage assignment events during execution are considered as optimization problems. A detailed set of data from a particular large timesharing system was taken to illuminate the storage use characteristics of the system load and provide parameter values for the theoretical models. In addition, these data were used directly in a simulation study of storage management techniques which served to bridge the gap between simple analytical models and the complexities of a real system. (Author)

Descriptors :   (*COMPUTER PROGRAMS, OPTIMIZATION), (*MEMORY DEVICES, CONTROL SYSTEMS), COMPUTER PROGRAMMING, MATHEMATICAL MODELS, SIMULATION, SCHEDULING, MULTIPLE OPERATION, STOCHASTIC PROCESSES, EFFICIENCY, TIME SHARING, DATA PROCESSING, ALGORITHMS, THESES

Subject Categories : Computer Programming and Software
      Computer Hardware
      Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE