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Getting Started

Service

When the transaction arrives at the Server, service is scheduled and the transaction ties up the server. By default, the service time is an observation of an exponential random variable with parameter 1. Both the service distribution and its parameters can be changed using the server's control panel. While the server is serving this transaction, any "are you busy" messages sent to it result in a "yes" response. When service is complete, the server sends the transaction on any arcs directed away from it and also sends a message up the arcs directed into it requesting an additional transaction. In this example, if the FIFO Queue is not empty, it will remove the transaction that has been there the longest and send it to the Server. By default, all queues in the system have a capacity of 50 transactions. Of course, this capacity can be changed through the user interface or programmatically, as discussed in the next chapter. Since by default the inter-arrival times and the service times are E(1), exponentially distributed with mean 1, the transaction time in the system would not have a stationary distribution if the queue had infinite capacity.

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