如何设置子模型的时间限制？

Question

我希望将给定配置的整个运行时间限制为1800s，该配置由主问题组成，通过这些主问题调用子问题:1和2。除此之外，您能告诉我如何针对不同的子模型设置不同的时间限制吗？例如，如果我想将子问题1的运行时间限制在500s，将子问题2的运行时间限制在800s。我使用了代码描述中所示的行- execute{ cplex.tilim=1800;}，但程序的运行时间超过1800s。

 //-----------------Main-problem.mod-------------------------------
 //variables definition here

 execute {cplex.tilim= 1800;}
 Objective function;

 subject to {
     Constraints:1-7
       }

 execute FillDuals {
     Dual of constraint 1;
         }       
 }   

 main{
 thisOplModel.settings.mainEndEnabled = true;
 thisOplModel.generate();
 var masterDef = thisOplModel.modelDefinition;
 var masterCplex = cplex;
 var masterData = thisOplModel.dataElements;
 var masterOpl = new IloOplModel(masterDef,masterCplex);
 masterOpl.addDataSource(masterData);
 masterOpl.generate();
 masterCplex.solve();
 masterOpl.postProcess();

 //\**************Calling Sub-Problem 1*********************************
 var SubSource1 = new IloOplModelSource("Sub-Problem1.mod");
 var Sub1Def = new IloOplModelDefinition(SubSource1);
 var Sub1Def = thisOplModel.modelDefinition;
 var Sub1Cplex = cplex;
 var Sub1Data = thisOplModel.dataElements;
 var Sub1Opl = new IloOplModel(Sub1Def,Sub1Cplex);
 Sub1Opl.addDataSource(Sub1Data);
 Sub1Opl.generate();
 Sub1Cplex.solve();
 //\****************************************************************

 //\*******************Calling Sub-Problem2*********************************
 var SubSource2 = new IloOplModelSource("Sub-Problem2.mod");
 var Sub2Def = new IloOplModelDefinition(SubSource2);
 var Sub2Def = thisOplModel.modelDefinition;
 var Sub2Cplex = cplex;
 var Sub2Data = thisOplModel.dataElements;
 var Sub2Opl = new IloOplModel(Sub2Def,Sub2Cplex);
 Sub1Opl.addDataSource(Sub2Data);
 Sub2Opl.generate();
 Sub2Cplex.solve();
 //\****************************************************************

 } //end of main

 //--------------------Sub-Problem1.mod------------------------
 variables and constants definition;
 Objective function;
 subject to {
     Constraints:
       }
 //SubOpl1 doesnt have main function main{}

  //-------------------Sub-Problem2.mod----------------------
 variables and constants definitions;
 Objective function;
 subject to {
     Constraints:
       }
 //SubOpl2 doesnt have main function main{}
 //-------------------------------------------------------

Answer 1

您可以像在预处理过程中一样设置时间限制，但也可以在主块中执行此操作：

你可以改变

Sub1Opl.generate();
Sub1Cplex.solve();

转到

Sub1Opl.generate();
Sub1Cplex.tilim=60;
Sub1Cplex.solve();

如果您需要Sub1CPLEX在60秒后停止。

注:该时间限制适用于cplex解算，因此如果您需要对多个解算设置总1800个时间限制，则需要对每个解算使用较小的时间限制。