how to determine whether a queue is empty in Simevents and do some actions based on this observation?

Hi guys,

I want to model a queue with vacations. When the queue is empty, the server will have a period of vacation with certain distribution.(I can use use gate to block the server ) So I need to get the data of the number of entity in queue block. Could you please tell me how to do that?

Many thanks.

[Tianhao Guo]

Sorry that I am not very familiar with Matlab. Maybe I can write a discrete event-driven queue using customized block. So if you know where to find these kinds of resources. It will be of great help as well.

Answer 1

[Nikhil Vyas]

The Queue blocks(and almost all the other similar blocks of simevents) has a Statistics Tab in the Block Parameters.

This would result in an additional port #n appearing on the block. You can monitor this port to check the number of entities in the queue at any time. If #n gives you 0, the queue is currently empty.

[Tianhao Guo]

Thank you for you answer. Sorry, I didn't explain clearly. A queue with vacation means that I need to close the gate as soon as the queue is empty. Then how to monitor this port? Maybe I should let the queue trigger something when it is empty.