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Jeff Smith Auburn University
Tandem Queueing Model Jeff Smith Auburn University
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V1 – Build Basic Simio Model V2 – Create and Run Experiment
Server 1 Server 2 Objective: Demonstrate a model-building exercise with Simio. V1 – Build Basic Simio Model V2 – Create and Run Experiment V3 – Capacitated Buffers V4 - Animation
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Metrics (all at steady state): Assumptions:
Server 1 Server 2 IAT ~ expo(1.25) min. ST ~ tria(1, 1.2, 1.4) min. ST ~ expo(1.1) min. Metrics (all at steady state): TIS – Time in System NIS – Number in System Thput – Throughput Assumptions: Servers have capacity 1 FIFO queues Initially infinite capacity queues, then experiment with capacitated queues
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The population of runspaces (realizations)
Instance of the ModelEntity object Average of the Time In System DefaultEntity.Population.TimeInSystem.Average The population of runspaces (realizations)
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Number of entities that entered Sink1’s input buffer. Warmup Period
Sink1.InputBuffer.NumberEntered/(Run.TimeNow – Run.WarmupPeriod) Current simulation time
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(Input Buffer Capacity + Server Capacity) > (Input Buffer Contents + Server Contents)
Server1.InputBuffer.Capacity Server1.InputBuffer.Contents Server1.Capacity Server1.Capacity.Allocated
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