[Couenne] Couenne produces a lot of output on verbosity level 0

[Pietro Belotti]

Hi Victor,

the output level you see is mostly related to CLP/CBC and is due to
the default settings of a few options in Couenne. To turn off most
output, the following options must be specified in a text file named
couenne.opt that is in the same directory from which Couenne is
launched:

output_level 0

bb_log_level 0
lp_log_level 0
nlp_log_level 0

The default values in trunk/ are now 2 for output_level, 1 for
bb_log_level, and 0 for the remaining two. The outlev option is not
used by Couenne and I doubt that Couenne reads options through the
AMPL command "option".

I hope this helps.
Pietro


On Wed, May 27, 2015 at 12:43 AM, victor.zverovich at gmail.com
<victor.zverovich at gmail.com> wrote:
> Hello,
>
> I've noticed that Couenne produces a lot of output on verbosity level 0
> (outlev=0). For example:
>
> ampl: model 3pk.mod;
> ampl: option solver couenne;
> ampl: option solver_options 'outlev=0';
> ampl: solve;
> Couenne 0.5.3 -- an Open-Source solver for Mixed Integer Nonlinear
> Optimization
> Mailing list: couenne at list.coin-or.org
> Instructions: http://www.coin-or.org/Couenne
> couenne:
> ANALYSIS TEST: Couenne: new cutoff value 2.0236538579e+04 (0.010316 seconds)
> NLP0012I
>               Num      Status      Obj             It       time
> Location
> NLP0014I             1         OPT 1.7201186       10 0.004382
> Couenne: new cutoff value 1.7201185696e+00 (0.018883 seconds)
> Loaded instance "/tmp/at4272.nl"
> Constraints:            0
> Variables:             30 (0 integer)
> Auxiliaries:           85 (0 integer)
>
> Coin0506I Presolve 234 (-15) rows, 100 (-15) columns and 638 (-30) elements
> Clp0006I 0  Obj 0.057685049 Primal inf 199.91031 (115)
> ...
>
> Normally outlev=0 disables all the solver output except for solve and error
> messages:
>
> ampl: option solver minos;
> ampl: solve;
> MINOS 5.51: optimal solution found.
> 0 iterations, objective 1.72011857
> Nonlin evals: obj = 3, grad = 2.
>
> It would be nice if Couenne followed the same convention.
>
> Thanks,
> Victor
>
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