Accession Number : AD0662225

Title :   INCREMENTAL SIMULATION ON A TIME-SHARED COMPUTER.

Descriptive Note : Doctoral thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE PROJECT MAC

Personal Author(s) : Jones,Malcolm M.

Report Date : 1967

Pagination or Media Count : 253

Abstract : The thesis describes a system which allows simulation models to be built and tested incrementally. It is called OPS-4 and is specifically designed to operate in the environment of the Multics system. It represents a major expansion and improvement of the OPS-3 system implemented in CTSS and also includes many features adapted from other current simulation systems. The PL/1 language, augmented by many additional statements and new data objects, provides the basis for defining models in OPS-4. A list of desirable features for an incremental simulation system is presented and it is shown how OPS-4 incorporates these features, whereas other current simulation systems satisfy only some of them and are not suitable for use in time-shared environment. A simplified model of page and segment fault handling in Multics illustrates some of the features OPS-4 provides to allow the user to continuously interact with a model during its construction, testing and running phases. It also illustrates how the user himself may portray portions of a model that are not yet defined. (Author)

Descriptors :   (*TIME SHARING, COMPUTERS), (*SIMULATION, COMPUTERS), PROGRAMMING LANGUAGES, REAL TIME, THESES, DISPLAY SYSTEMS

Subject Categories : Computer Programming and Software
      Computer Hardware
      Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE