[Couenne] Clp0006I

[Jasper Boekel]

Dear sir, sirs,

I have a problem while trying to solve a MINLP. I use couenne together with
Pyomo, however when applying couenne directly to the .nl file I encounter
the exact same problem.

I added a reproducible example for generating and solving the problem as
well as the couenne options file. So I put a time_limit of 30 seconds in
the options file. Now what happens is that couenne starts optimizing until
the 30 seconds boundary is reached. However, subsequently it just keeps
infinitely printing rows like the ones below.

Clp0006I 26150  Obj 9574.1254 Primal inf 604.9011 (27) Dual inf 261306.19
(23)
Clp0006I 26152  Obj 9574.1254 Primal inf 257.8018 (27) Dual inf 406.59172
(22)
Clp0006I 26155  Obj 9574.1254 Primal inf 620.87745 (29) Dual inf
5.6336085e+13 (24)
Clp0006I 26156  Obj 9574.1254 Primal inf 609.66265 (29) Dual inf 2998.5172
(23)
Clp0006I 26158  Obj 9574.1254 Primal inf 255.92422 (27) Dual inf 353.53079
(22)
Clp0006I 26161  Obj 9574.1254 Primal inf 627.48252 (28) Dual inf
1.4600708e+14 (25)

I have found that when I tweak some options in the couenne.opt file such as
feasibility_bt, optimality_bt and aggressive_fbbt it solves the problem.
However I have to solve this problem for every day for a 3 year period and
every problem needs a different combinations of options.

Any help would be greatly appreciated.

Kind regards,


Jasper Boekel
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