Constant content of queue (or CONWIP)

Hi,

Here's a simplified model: Source->Queue->(UseTransport tasksequence)->Sink

I would like the queue to contain at least 3 FlowItems (in order to keep busy 3 operators)



Solutions, which may make the model very slow are the following:

1) Have a queue with a big number of FlowItems generated at time 0 - so it never runs out of FlowItems

2) Have a queue with capacity 3 and a source generating FlowItems with inter-arrival time 0



Is there a way to use a command like createinstance() to generate FlowItems, or can a source generate FlowItems "on command"?

Thanks!

Hi Stefan,

i would take the queues OnExit-Trigger to check the content. If the content is underneath a certain level, i would use the insertcopy()-comand to refill the queue.

Could this help?

Greetings,
FlorianK

Hi Florian,

Yes, it helps, thanks. What I've forgotten to say is that the FlowItems have labels (& itemtype) which are generated randomly. This is done in the OnCreation trigger of the Source until now. I would like the new FlowItems' labels to follow the same distribution rules as the created ones.

I could displace the labels' setting to the OnEntry trigger of the Queue?

I would do the label and item setting right after the insertcopy() comand.
You can label the Items with the same randomnes there like you do it on the source.
Futhermore I would create the Items directly in the Queue by using the OnExit-Trigger (see post before).

Greetings,
FlorianK

-Labels' settings displaced to OnEntry trigger of the Queue
-Using insertcopy() command