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Select Arrival Path Using Input Switch

5-9

Select Arrival Path Using Input Switch

In this section...

“Role of the Input Switch” on page 5-9

“Round-Robin Approach to Choosing Inputs” on page 5-9

Role of the Input Switch

The block in the Routing library chooses among a number of entity input ports. This

block selects exactly one entity input port for potential arrivals and makes all other

entity input ports unavailable. The selected entity input port can change during the

simulation. You have several options for criteria that the block uses for selecting an

entity input port.

A typical scenario in which you might use an input switch is when multiple sources

of entities feed into a single queue, where the sequencing follows specific rules. For

example, users of terminals in a time-shared computer submit jobs to a queue that feeds

into the central processing unit, where an algorithm regulates access to the queue so as

to prevent unfair domination by any one user.

Round-Robin Approach to Choosing Inputs

In a round-robin approach, an input switch cycles through the entity input ports in

sequence. After the last entity input port, the next selection is the first entity input

port. The switch selects the next entity input port after each entity departure. When the

switch selects an entity input port, it makes the other entity input ports unavailable,

regardless of how long it takes for an entity to arrive at the selected port.

You can implement a round-robin approach by setting the Switching criterion

parameter in the Input Switch block to Round robin.

Consider the following example, in which three sets of entities attempt to arrive at an

Input Switch block with the round-robin switching criterion.

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MATLAB SIMEVENTS RELEASE NOTES Guide de l'utilisateur Page 99