Originally posted by: dany__

I've wrote a MIP problem about crew scheduling and I want to see the progress.
With a callback I want to see the incumbent objvalue every seconds
I've wrote a MIPINFOCALLBACK but the program never enter in the callback and don't write nothing
an example of the callback wrote is:

ILOMIPINFOCALLBACK2(returnCallback,
IloCplex, cplex,
IloNum, timeStart)
{
if ( hasIncumbent() ) {
IloNum timeUsed = cplex.getCplexTime() - timeStart;
cout<<"time : "<<timeUsed<<" value = "<<getIncumbentObjValue();

}
//cout<<"time : "<<timeUsed<<" value = "<<getIncumbentObjValue();
}

and call with

cplex.use(returnCallback(env, cplex, cplex.getCplexTime));
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

And how does the log file look like? Maybe it takes forever to solve the root LP relaxation. CPLEX only calls the info callback for each node in the search tree, and if the root node already takes a very long time, then the info callback will not be called for quite a while.

Tobias
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: dany__

Thank you, I've found the problem
it was in the code for the algorithm
#CPLEXOptimizers
#DecisionOptimization