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Role of Paths in SimEvents Models

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model below shows two queues in a parallel arrangement, preceded by a block that has

one entity input port and two entity output ports.

By looking at the entity connection lines alone, you cannot tell which queue block's IN

port an entity will arrive at. Instead, you need to know more about how the one-to-two

block (Output Switch) behaves and you might even need to know the outcome of certain

run-time decisions.

Overview of Routing Library for Designing Paths

You design entity paths by choosing or combining entity paths using some of the blocks

in the Routing library of the SimEvents library set. These blocks have extra entity ports

that let you vary the model's topology (that is, the set of blocks and connection lines).

Typical reasons for manipulating entity paths are

• To describe an inherently parallel behavior in the situation you are modeling — for

example, a computer cluster with two computers that share the computing load. You

can use the Output Switch block to send computing jobs to one of the two computers.

You might also use the Path Combiner or Input Switch block if computing jobs share

a common destination following the pair of computers.

• To design nonlinear topologies, such as feedback loops — for example, repeating an

operation if quality criteria such as quality of service (QoS) are not met. You can

use the Path Combiner block to combine the paths of new entities and entities that

require a repeated operation.

• To incorporate logical decision making into your simulation — for example,

determining scheduling protocols. You might use the Input Switch block to determine

which of several queues receives attention from a server.

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MATLAB SIMEVENTS RELEASE NOTES Guia do Utilizador Página 93