Ask Your Question

solver_parameter('timelimit') doesnt work

asked 2015-11-03 07:47:45 +0100

updated 2015-11-04 04:00:47 +0100


I have an MILP problem and trying to solve it with Sage, GLPK solver. As I want to terminate the problem before getting the optimum answer, I am using the p.solver_parameter("timelimit", 60). I have also used

    except MIPSolverException:
        b = p.get_backend()
        print('best known opjective bound', b.best_known_objective_bound())

However, the solver doesn't stop!!! It keeps runing. I guess the time limit part doesn't work. Its interesting that the p.solver_parameter("time limit") its affected, as I am printing its value before passing the p.solve(). I have also tried p.solver_parameter( backend.glp_simplex_or_intopt, backend.glp_intopt_only) and printed the p.solver_parameter("time limit_intopt"). It's printing 60000 which is right. I have no idea why it keeps running.

Could anyone help me with this issue?

Thanks in advance,

Cheers, Aissan

edit retag flag offensive close merge delete

2 Answers

Sort by ยป oldest newest most voted

answered 2015-11-03 16:08:50 +0100

Nathann gravatar image

Could you show us a minimal working example of what you do? If you tell me that you set the time limit and that the time limit is not respect, then it is a bug.

edit flag offensive delete link more


I am actually printing the timelimit and it affected. However, it keeps running unless I manually interrupt it.

Here is my code:

p = MixedIntegerLinearProgram(maximization=False, solver = "GLPK")

p.solver_parameter( "timelimit", 60)

Z =    p.new_variable ( binary= True)

#### defining all the variables and constrains here #####

p.set_objective(   p.sum(COSTPenalty * (1-Z[k])   for k in   Requests.keys()))

b= p.get_backend()

print (p.solver_parameter( 'timelimit'))

try :


    return (p.get_objective_value() )

except MIPSolverException:

    b= p.get_backend()

    print ('the best known objective bound is ',b.best_known_objective_bound())

    return b.best_known_objective_bound()

Thanks a lot!

Aissan Dalvandi gravatar imageAissan Dalvandi ( 2015-11-04 03:49:27 +0100 )edit

answered 2015-11-06 06:47:16 +0100

Its working but its based on computation time, NOT execution time. However, still not sure about the relation between these two!

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower


Asked: 2015-11-03 07:47:45 +0100

Seen: 329 times

Last updated: Nov 06 '15