Accession Number : AD0668078

Title :   STEPS TOWARD A GENERAL PURPOSE TIME-SHARING SYSTEM USING LARGE CAPACITY CORE STORAGE AND TSS/360,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE

Personal Author(s) : Fikes,Richard E. ; Lauer,Hugh C. ; Vareha,Albin L. , Jr

Report Date : MAR 1968

Pagination or Media Count : 38

Abstract : This paper is a progress report of an effort at Carnegie-Mellon University to determine how a large capacity core storage facility (LCS) can be used to reduce the demand paging overhead costs in the IBM System/360 Time Sharing System (TSS/360) and in similar general purpose time-sharing systems. A discussion is presented of how the number of paging operations and the cost of each paging operation can be reduced by using LCS as both a swapping device and an extension of executable core. Two problems which arise are considered. A new algorithm for releasing core is presented and compared with two existing algorithms. Finally, results from a feasibility implementation of the ideas in a pre-release version of TSS/360 are presented as a demonstration of the validity of using LCS to reduce paging overhead. (Author)

Descriptors :   (*DATA STORAGE SYSTEMS, TIME SHARING), INFORMATION RETRIEVAL, COMPUTER PROGRAMMING, COSTS, DECISION MAKING, CYBERNETICS, TIME, ALGORITHMS, FLOW CHARTING, CORRELATION TECHNIQUES

Subject Categories : Information Science
      Computer Programming and Software
      Computer Hardware
      Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE