Originally posted by: Rajasekhar_Kadambur

Hi,

 

I am trying to bench mark a model by playing around the settings parameters.

 

I trying to solve the CP model for various number of workmen.

the model is as follows:

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

range cores = 1..10;
int NoWorker[cores] = [32,24,20,16,12, 8,6,4,2,1];

 main {
 
   thisOplModel.generate();
   var data1 = thisOplModel.dataElements;

   var opl2 = new IloOplRunConfiguration("Learning_BenchMarking.mod","Learning_BenchMarking.dat");
   var source2 = new IloOplModelSource("Learning_BenchMarking.mod");
   var data1 = new IloOplDataSource("Learning_BenchMarking.dat");
   
   opl2.cp.param.timemode = "ElapsedTime";
   opl2.cp.param.timelimit = 150;
   opl2.cp.param.SearchType = "MultiPoint";

          writeln("Cores    Objective")

    for(var i in thisOplModel.cores){
       opl2.cp.param.workers = thisOplModel.NoWorker[i];
      if (opl2.cp.solve()){
          writeln(thisOplModel.NoWorker[i],"    ",opl2.cp.getObjValue());  
      }
      
    }
}  

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//output is like this

Cores    Objective
32    null
24    null
20    null
16    null
12    null
8    null
6    null
4    null
2    null
1    null

 

How to resolve this issue.

i am fixing the

solve time to 600 seconds

search method to MultiPoint

TimeMode is ElapsedTime

 

Any suggestion are welcome. thanks in advance.

#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: rdumeur

Dear Rajasekhar_Ka...

 

In order to help you, I'll have a few questions:

- could you please precise the version of CPO you are using?

- have you tried the default search on your model, and if so, does it produce a solution?

- could you please post the .cpo file corresponding to your model (using oplrun -d dumpedmodel.cpo ... ), it'll help us have a closer look at your problem.

Cheers,

                Renaud

 

 

#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: rdumeur

Hi,

I tried to reproduce your problem, and your OPL script appears to be incorrect.

Please try:

ange cores = 1..10;
int NoWorker[cores] = [32,24,20,16,12, 8,6,4,2,1];

 main {
 
   thisOplModel.generate();
   //   var data1 = thisOplModel.dataElements;

   var opl2 = new IloOplRunConfiguration("Learning_BenchMarking.mod", "Learning_BenchMarking.dat");
   opl2.oplModel.generate();

   //   var source2 = new IloOplModelSource("Learning_BenchMarking.mod");
   //   var data1 = new IloOplDataSource("Learning_BenchMarking.dat");
   
   opl2.cp.param.timemode = "ElapsedTime";
   opl2.cp.param.timelimit = 150;
   opl2.cp.param.SearchType = "MultiPoint";

          writeln("Cores    Objective")

    for(var i in thisOplModel.cores){
       opl2.cp.param.workers = thisOplModel.NoWorker[i];
      if (opl2.cp.solve()){
          writeln(thisOplModel.NoWorker[i],"    ",opl2.cp.getObjValue());  
      }
      
    }
}

You don't generate the model loaded from the configuration, and you needlessly create model source and data sources which are already created by the run configuration.

I hope this helps.

 

Cheers,

 

#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: Rajasekhar_Kadambur

Hi @rdumeur 9d5f323d-1ec8-4bc7-9d0a-74fe731d4a14

 

Sorry for Late reply, I am occupied with some other work.

 

Thanks for your Help, Its Working.

I do need some help how to master or explore all the feature for OPL Programming for CPLEX and CP Optimizer.

If there is any documents regarding this would a great help.

 

The problem i am working on have to be solved iteratively and/or calling mutiple submodels.

how to export the EngineLog and track the performance of each submodel such as number of fails and choice points ...

#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: rdumeur

Dear Rajasekhar_K...

 

You can find documentation there: http://www-01.ibm.com/support/knowledgecenter/SSSA5P_12.6.2/ilog.odms.studio.help/Optimization_Studio/topics/COS_home.html?lang=en

for both CPLEX and CP optimizers.

To track performance by gathering infos such as number of fails and choice points you can try access infos of the cp solver by using in your model :

   opl2.cp.info.XXX

to access property XXX (please consult CPOptimizer's documentation for the list of infos).

To export the engine log, I have to dig myself in the doc, and will be back to you!

Cheers,

 

Edit: there is an OPL example which load & solves multiple models: You can find it in the distribution at : CPLEX_Studio1262/opl/examples/opl/vellino. Note that it shows that you have to invoke .end() on each run configuration when it is no longer needed.

 

#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: Rajasekhar_Kadambur

Thanks For the help.

I will get back to you if stuck somewhere.

 

Regards Raj

#DecisionOptimization
#OPLusingCPOptimizer