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):

Report Date:

1967-01-01

Pagination or Media Count:

253.0

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 PL1 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

Subject Categories:

  • Computer Programming and Software
  • Computer Hardware
  • Computer Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE