Lines in a Parallel Universe

This model is designed to compare two common queue arrangements. In the top arrangement, items enter one of three queues. Each queue has it's own server. An item is not able to transfer from one queue to another. In the bottom arrangement, one queue feeds three servers.

The input for both arrangements is exactly the same regarding item arrival rate and service requirements. That is, both arrangements get the same items at the same time with the same service demand.

Items arrive with an exponential distribution averaging 5 seconds. There are three choices for service time. The default service time is fixed at 15 seconds. The second choice is uniform distribution between 10 and 20 seconds. The third is a triangular distribution between 5 and 25 seconds with a most common value of 15.

You can pause the simulation, reset the statistics, and change the service distribution.

If you have any questions, suggestions or comments, please pass them along.

Steve Murtha (

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