Originally posted by: alam0118

Hi everyone

I am using CPLEX 12.9 and i got a problem for setting a time limit. Whenever i put time limit, say 10 seconds, CPLEX will do 10 seconds and then carry on for another 10 seconds (see attached), does anyone know whats happining? 

The most likely reason is that you call solve() twice in a row. Can you show the code that starts the solve?

Originally posted by: alam0118

Thanks Daniel for your reply

The code contains one solve(), but there is if (!cplex.solve()) after afew lines. Thats what i have 

                float timeLimit = 10.0; 
                cplex.setParam(IloCplex::TiLim, timeLimit);
                time_t start, end;
                double total_time;
                start = clock();
                cplex.solve();
                end = clock();
                total_time = (double)(end - start) / (double)CLK_TCK;

Note; i have a loop to solve only the LP relaxation and then solve it again (the same instance) to optimality with the limited time. Does that cause such an issue? 

What your log shows is that you are calling solve() more than once. I suggest you do the following:

Before each line that contains the text 'cplex.solve()' you put something like

std::cout << "Calling solve from line " << __LINE__ << std::endl;

Then your log should show some of this output before each solve and you can figure out where the second solve is triggered from.

Note that a statement like 'if (!cplex.solve())' will also trigger a solve that runs for 10 seconds.

Originally posted by: alam0118

The problem was because i have cplex.solve(); and then  'if (!cplex.solve())'. The latter statement is deleted and the problem is solved..

Many Thanks Daniel ..