1. Jeff Smith Auburn University
Tandem Queueing Model
Jeff Smith Auburn University

2. 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

3. 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

4. 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)

5. Number of entities that entered Sink1’s input buffer. Warmup Period
Sink1.InputBuffer.NumberEntered/(Run.TimeNow – Run.WarmupPeriod)
Current simulation time

6. (Input Buffer Capacity + Server Capacity) > (Input Buffer Contents + Server Contents)
Server1.InputBuffer.Capacity
Server1.InputBuffer.Contents
Server1.Capacity
Server1.Capacity.Allocated