Macro requirement within a simulation interface
Article Abstract:
The use of simulation has traditionally required a great deal of expertise. Simulation Interfaces to General Purpose Simulation Languages made simulation easier to use. However, for successfully building simulation models, modelling expertise is still required. Macros have been proposed as a tool within Simulation Interfaces which simplify the building of models. A macro in this context should be seen as a group of Simulation Language statements with a data interface to the user. The questions to be answered were: 'What should a macro do and how should it be implemented?' The first objective of the work was to specify the macro functionality more tightly and then develop some macros. The wide range of macro applications allows categorizing. An attempt was made to classify the different types of macros in a hierarchical structure. Implementation of macros in SIMAN (trademark registered)/1~, showed difficulties such as nesting, attribute sharing, and code connectivity. To make data input for complete models less laborious, generic data interfaces were proposed. A simple model of a manufacturing cell is discussed, to show some of the above mentioned aspects. It became clear that macros could considerably speed up model building. However, bigger macros could reduce modelling flexibility to some extent. (Reprinted by permission of the publisher)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1993
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Simulation of main memory database recovery
Article Abstract:
In a main memory database (MMDB), the primary copy of the database may reside permanently in a volatile memory. When a system failure occurs, the database must be reloaded efficiently from archive memory into main memory. This paper presents four different reload schemes and the simulation models constructed to compare the algorithms. Simulation results indicate that the reload scheme based on frequency of data access gives the best overall performance in terms of transaction response time and system throughput. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
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