How to display a solution with using timelimit in CPLEX for scheduling(CP)

Question

Now I am trying to get a solution within a specific time-limit in my code.

Actually, my problem(scheduling) is NP-hard.

It spends lots of time to get a solution or out of memory. So, I set a time-limit in my code(60s) and I'd like to get a solution(scheduling) solved for 60s.

Is it possible?

If possible, please let me know.

Thank you, sir.

Alex Fleischer · Accepted Answer · 2019-12-14 10:18:40Z

1

yes you can stop after a time limit

In OPL you would write

execute {
        cp.param.timelimit = 60;
}

You have the same parameter for all APIs

answered Dec 14, 2019 at 10:18

Alex Fleischer

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3 Comments

sangho park Over a year ago

Sir, I used that code in my iteration mod file. But it doesn't give a solution(real schedule), but only give an Objective function value. I mean, simply, I want to get a solution 'OP-value like 23.254", I want to get a solution schedule with decision variation like [1 0 1 0 1 1 1 0] Thank you, sir.

sangho park Over a year ago

Additionally, it could be a little fundamental question, if it is possible, why do we use a technique of heuristic for that kind of problem? I mean, most of the timelimit solutions by MILP(CPLEX) better than a heuristic solution. Thank you, sir.

Alex Fleischer Over a year ago

Hi, if you use OPL and CPLEX , in the postprocess part you may print any results through writeln functions in execute blocks See ibm.com/developerworks/community/forums/html/…

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