Originally posted by: kapsalis89

Hi all,

we are working in an assignment in which we have to implement a model of a production process. During the process, there are some demands and each demands consists of a number of steps. Each step has some alternatives about the resources that can use. Also, for some steps a setup is required, and if there is a delay between steps, the product is stored in a storage tank.

For testing our model, we have five instances. In the small one, our model works fine. The results are really close to the expected. The problems start in bigger instances.

When we try to run the model we get : "Oplrun process is not responding, you must relaunch the Run Configuration" error, with any other information. The configuration stops running. Also, in the log files we have this entry:

!ENTRY ilog.odms.ide.core 4 0 2016-10-29 00:23:54.454

!MESSAGE Connection refused to host: 127.0.0.1; nested exception is:

               java.net.ConnectException: Connection refused: connect

We tried to run it from command line with oplrun command and we got "UNEXPECTED ERROR" message.

We tried the solutions proposed here and here. Also, we run the model in four different machines. The same problem.

Could anyone give us a reason why this happens?

Thank you in advance,

Kind Regards

Michalis

Hi,

can you post your model ?

regards

Originally posted by: kapsalis89

Hi,

 I am attaching the model and one of the instances that we have problem. 

regards,
Michalis

production.mod|View Details

Originally posted by: ol

Hello,

for some unknown reason, we cannot download the above files. can you post again the model? 

Regards,

Olivier

Originally posted by: kapsalis89

Hi again,

I uploaded them in google drive, so I hope that you have access to them with the following link:

https://drive.google.com/drive/folders/0B_Y0B41ONxnrOTF4LXI1Y004Zms?usp=sharing

Please, let me know if you can get the files,

Regards

Michalis

Edit: I think that I fixed the problem with the files above. However, for any case, I leave the google drive link here.

Hi,

could you try to replace

forall(<d,a> in DemandAlts)
        set1:    presenceOf(productionStepsOnAlternatives[<d,a>]) == presenceOf(setupStepsOnAlternat
        forall(<d,a> in DemandAlts)
    set2:    endAtStart(setupStepsOnAlternatives[<d,a>],productionStepsOnAlternatives[<d,a>]);
     
    forall(<d,a> in DemandAlts, r in Resources : a.resource_id == r.resource_id)
    set3:    sizeOf(setupStepsOnAlternatives[<d,a>]) ==
            setupTimeArray[r][typeOfPrev(demandOnResource[r], productionStepsOnAlternatives[<d,a>],r.initial_product_id,-1)][d.product_id];

by

forall(da in DemandAlts)
        set1:    presenceOf(productionStepsOnAlternatives[da]) == presenceOf(setupStepsOnAlternatives[da]);

forall(da in DemandAlts)
    set2:    endAtStart(setupStepsOnAlternatives[da],productionStepsOnAlternatives[da]);
     
    forall(da in DemandAlts, r in Resources : da.resource.resource_id == r.resource_id)
    set3:    sizeOf(setupStepsOnAlternatives[da]) ==
            setupTimeArray[r][typeOfPrev(demandOnResource[r], productionStepsOnAlternatives[da],r.initial_product_id,-1)][da.demand.product_id];

?

regards

Originally posted by: kapsalis89

Hi AlexFleischer

thank you for your reply. It is the solution of our problem. We changed all the constraints to have the same implementation.

Could you explain why our implementation with <d,a> crashed the opl?

Thank you again

Regards

Michalis

Hi,

the issue is linked with labels so you could also do a smaller change and write:

forall(<d,a> in DemandAlts)
            presenceOf(productionStepsOnAlternatives[<d,a>]) == presenceOf(setupStepsOnAlternatives[<d,a>]);
forall(<d,a> in DemandAlts)
        endAtStart(setupStepsOnAlternatives[<d,a>],productionStepsOnAlternatives[<d,a>]);
     
    forall(<d,a> in DemandAlts, r in Resources : a.resource_id == r.resource_id)
        sizeOf(setupStepsOnAlternatives[<d,a>]) ==
            setupTimeArray[r][typeOfPrev(demandOnResource[r], productionStepsOnAlternatives[<d,a>],r.initial_product_id,-1)][d.product_id];

but then you do not have the label.

regards

Originally posted by: kapsalis89

Hi again,

thank you a lot for your answers and your help.

Regards

Michalis