Originally posted by: baohu

Hi I created an optimization model with OPL in a MOD file, which can be directly solved by CPLEX studio.

After that I converted this MOD file to LP file and solve it using Python

I did not specify any parameter setting. Therefore, I assumed that in both of these methods I have used the default parameters setting.

However, the results are different. The result obtained from CPLEX studio is better than the second method.

Any clue in it and Do I need to do any improvement?

First of all, you should use a SAV file, not an LP file. Can you try with this? I take it you are using the exact same machine for both solves?

Originally posted by: baohu

Thanks for reply. I would try the SAV format. Yes, the running environment was the same (same machine)

Originally posted by: baohu

It works while using a SAV file and the results are even better than directly using CPLEX studio. The following JAVA codings are also workable for conversion MOD to SAV

 {
        IloOplFactory.setDebugMode(true);
        IloOplFactory oplF = new IloOplFactory();
        IloOplErrorHandler errHandler = oplF.createOplErrorHandler(System.out);
        IloOplModelSource modelSource=oplF.createOplModelSource("./data/xxx.mod");
        IloOplSettings settings = oplF.createOplSettings(errHandler);
  settings.setWithNames(true);
        IloOplModelDefinition def=oplF.createOplModelDefinition(modelSource,settings);  
        IloCplex cplex = oplF.createCplex();
        IloOplModel opl=oplF.createOplModel(def,cplex);
        IloCplex  memset=new IloCplex();
        memset.setParam(IloCplex.BooleanParam.MemoryEmphasis,true);
      

        IloOplDataSource dataSource=oplF.createOplDataSource("./data/xxxx.dat");
        opl.addDataSource(dataSource);
        opl.generate();
  
        cplex.exportModel("./data/xx.sav");
        cplex.end();
        oplF.end();
        }