Quaestiones Informaticae Vol 2 No 3https://ir.unisa.ac.za/handle/10500/240032026-05-06T12:40:48Z2026-05-06T12:40:48ZModelling Blocking on Admission of Tasks to Computer SystemsWulf, S.https://ir.unisa.ac.za/handle/10500/240572018-05-24T01:01:22Z1983-01-01T00:00:00ZModelling Blocking on Admission of Tasks to Computer Systems
Wulf, S.
The need for modelling techniques to allow blocking of tasks prior to admission to the computer system in queueing
network models is described. A detailed algorithm which presents a technique to enforce blocking by priority of class
for an arbitrary number of blocking constraints is presented. The resultant solution is exact and produces an analysis
by class of admission queueing delays.
1983-01-01T00:00:00ZNebulas as Structural Data ModelsVan Rooyen, H.O.Weiermans, D.J.https://ir.unisa.ac.za/handle/10500/240562018-05-24T01:01:21Z1983-01-01T00:00:00ZNebulas as Structural Data Models
Van Rooyen, H.O.; Weiermans, D.J.
Nebula modell_ing is_ a generalised structural modelling technique which applies to any finite set of objects (entities)
and n-ary relat1onsh1ps (n ~2). A nebula model can be presented in either diagrammatic or tabular form, and combines
the properties of graph (binary) data models with those of tabular (relational) data models. We give a brief introduction
to nebula data modelling by means of a simple illustration.
1983-01-01T00:00:00ZAn Improved Implementation of Grimbleby's AlgorithmSchach, Stephen R.https://ir.unisa.ac.za/handle/10500/240552018-05-24T01:01:22Z1983-01-01T00:00:00ZAn Improved Implementation of Grimbleby's Algorithm
Schach, Stephen R.
Details are given of an implementation of Grimbleby's algorithm for the common spanning tree problem with running
times up to 50% less than for the original implementation. An explanation is given as to why implementations with
even lower running times are unlikely.
1983-01-01T00:00:00ZAn Analytical Model of a Mixed-Workload MVS Computer SystemMann, R.J.https://ir.unisa.ac.za/handle/10500/240542018-05-24T01:01:22Z1983-01-01T00:00:00ZAn Analytical Model of a Mixed-Workload MVS Computer System
Mann, R.J.
A basic description of the facilities of the computer modelling package, AUTO-CONFIGURATER, is presented together
with detailed procedures to calculate the required input parameters from monitor statistics. Techniques to calibrate
the model are described together with an investigation into how the modelling package enables configuration and
tuning alternatives to be evaluated.
1983-01-01T00:00:00Z