By G. BIRTWISTLE
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Extra info for A System for Discrete Event Modelling on Simula
12. A small grocery store has three aisles and cwo checkout counters. Shoppers arrive at the store with a mean inter-arrival time of 100 seconds, NEGEXP distributed. on arrival, each takes a basket and may go down one or more of the three aisles selecting items for purchase as she/he proceeds. 0 53 No. of items RANDINT:2->4 RANDINT:3->5 RANDINT:6->8 When shopping has been completed, the customers queue up FCFS fashion at one of two checkout counters. Here each chooses another 1->3 impulse items (RANDINT distributed).
8. 6) are created at clock time zero. This may be tolerable in a small simulation involving only a few entities, but in larger models this method of dealing with transient entities is not acceptable. As an example, consider running our model of the Port System over 10,000-20,000 time units. Perhaps 1000 boats will pass through, but no more than 5 or 6 may be in contention at any one time. To create all the boat objects at time zero wastes much space in the computer and clutters up the event list.
Associated with each such object is the known time of its next event - the time at which it is due to be first released into the simulation, or the time at which its current activity is due to finish. ) Scheduled objects are ranked according to the REAL value of their next event time. Scheduling is framed so that the object at the head of the event list (the one with the least event time) is active. It has the standard reference REF(ENTITY)PROCEDURE CURRENT and its event time is always available through a call on the standard REAL PROCEDURE TIME.
A System for Discrete Event Modelling on Simula by G. BIRTWISTLE