[Bonmin] stopping Bonmin

Sat Jul 4 08:24:10 EDT 2009

Hi,

> I am sorry for all these messages.
> 
> Still solving a MINLP with B-BB. My problem now is why both
> 
> bonmin.time_limit 1
> bonmin.iteration_limit 10
> 
> 
> seem not to work even if put together?. For the Time limit I am not
> sure if we are talking about
> cputime or whatever but when I stopped (ctrl-c) the computation all
> values where above my limit
> (see below). I have read the documentation and it seems that just one
> of the two limits should
> have worked. I also added the "\n" character at the and of the last
> line and the prefix "bonmin.".
> Can someone, please, suggest me a way to stop the computation?

Someone correct me if I'm wrong, but I think Bonmin does not enforce the
timelimit during the Ipopt run.
But there is a new Ipopt option to limit the time:
http://www.coin-or.org/Ipopt/documentation/node70.html
Does it help when you add a
max_cpu_time 1
to your option file (without "bonmin."-prefix) ?

Stefan

> 
> Many many thanks
> 
> giuseppe
> 
> 
> WARNING: Tried to set option "print_level" to a value of "1",
>          but the previous value is set to disallow clobbering.
>          The setting will remain as: "print_level 6"
> 
> List of options:
> 
>                                     Name   Value                # times used
>                         bonmin.algorithm = B-BB                      1
>                      bonmin.bb_log_level = 4                         2
>                   bonmin.iteration_limit = 10                        1
>               bonmin.number_before_trust = 1                         0
>              bonmin.number_strong_branch = 1000                      0
>                        bonmin.time_limit = 1                         1
>                bonmin.variable_selection = nlp-strong-branching      0
>                expect_infeasible_problem = yes                       2
>                                gamma_phi = 1e-08                     1
>                              gamma_theta = 0.0001                    1
>                                mu_oracle = probing                   2
>                              mu_strategy = adaptive                  2
>                              print_level = 6                         3
>                           print_solution = yes                       1
>         required_infeasibility_reduction = 0.1                       0
> 
> ******************************************************************************
> This program contains Ipopt, a library for large-scale nonlinear optimization.
>  Ipopt is released as open source code under the Common Public License (CPL).
>          For more information visit http://projects.coin-or.org/Ipopt
> ******************************************************************************
> 
> NOTE: You are using Ipopt by default with the MUMPS linear solver.
>       Other linear solvers might be more efficient (see Ipopt documentation).
> 
> 
> This is Ipopt version 3.6stable, running with linear solver mumps.
> 
> Number of nonzeros in equality constraint Jacobian...:    10581
> Number of nonzeros in inequality constraint Jacobian.:     1684
> Number of nonzeros in Lagrangian Hessian.............:     1440
> 
> Scaling parameter for objective function = 1.000000e+00
> Equality constraints are scaled with smallest scaling parameter is 1.000000e-01
> Inequality constraints are not scaled.
> Moved initial values of x sufficiently inside the bounds.
> 
> 
> ....................................................................................
> ....................................................................................
> ....................................................................................
> ....................................................................................
> ....................................................................................
> ....................................................................................
> ....................................................................................
> ....................................................................................
> ....................................................................................
> ....................................................................................
> 
> 
> 
>  **************************************************
> *** Update HessianMatrix for Iteration 138:
> **************************************************
> 
> 
> 
> **************************************************
> *** Summary of Iteration: 138:
> **************************************************
> 
> iter    objective    inf_pr   inf_du lg(mu)  ||d||  lg(rg) alpha_du alpha_pr  ls
>  138 -6.7209529e+01 3.64e-02 2.18e+06   1.0 9.05e-01   5.4 1.81e-01
> 1.07e-01h  1 Fl
> 
> **************************************************
> *** Beginning Iteration 138 from the following point:
> **************************************************
> 
> Current barrier parameter mu = 1.0903679534902398e+01
> Current fraction-to-the-boundary parameter tau = 9.8999999999999999e-01
> 
> ||curr_x||_inf   = 1.9661942024696255e+05
> ||curr_s||_inf   = 1.2178079283934749e+04
> ||curr_y_c||_inf = 2.6443132699285839e+07
> ||curr_y_d||_inf = 1.2624137038804408e+07
> ||curr_z_L||_inf = 5.3355026600588057e+06
> ||curr_z_U||_inf = 2.2719144233394220e+07
> ||curr_v_L||_inf = 1.0903812213355341e-08
> ||curr_v_U||_inf = 1.0900972670818821e+07
> 
> 
> ***Current NLP Values for Iteration 138:
> 
>                                    (scaled)                 (unscaled)
> Objective...............:  -6.7209528968436345e+01   -6.7209528968436345e+01
> Dual infeasibility......:   2.1777462890798487e+06    2.1777462890798487e+06
> Constraint violation....:   3.6405018980666198e-02    9.8824327150319968e-02
> Complementarity.........:   1.8107150690355127e+02    1.8107150690355127e+02
> Overall NLP error.......:   6.6624480905292455e+02    2.1777462890798487e+06
> 
> 
> 
> 
> **************************************************
> *** Update Barrier Parameter for Iteration 138:
> **************************************************
> 
> Remaining in fixed mu mode.
> Barrier Parameter: 1.090368e+01
> 
> **************************************************
> *** Solving the Primal Dual System for Iteration 138:
> **************************************************
> 
> Number of doubles for MUMPS to hold factorization (INFO(9)) = 253214
> Number of integers for MUMPS to hold factorization (INFO(10)) = 142227
> In MumpsSolverInterface::Factorization: negevals_ = 3903, but
> numberOfNegEVals = 3353
> Factorization failed with retval = 2
> Number of doubles for MUMPS to hold factorization (INFO(9)) = 129365
> Number of integers for MUMPS to hold factorization (INFO(10)) = 138707
> In MumpsSolverInterface::Factorization: negevals_ = 3354, but
> numberOfNegEVals = 3353
> Factorization failed with retval = 2
> Number of doubles for MUMPS to hold factorization (INFO(9)) = 129365
> Number of integers for MUMPS to hold factorization (INFO(10)) = 138707
> 
> 
> real    2m40.741s
> user    1m46.039s
> sys     0m1.736s
> 
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> 