[Ipopt-tickets] Re: [Ipopt] #14: Termination code 11 - when using ampl and Pardiso linear solver

[Ipopt]

#14: Termination code 11 -  when using ampl and Pardiso linear solver
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  Reporter:  rodrigo            |       Owner:  ipopt-team
      Type:  defect             |      Status:  new       
  Priority:  high               |   Component:  Ipopt     
   Version:  3.0 - C++ Version  |    Severity:  major     
Resolution:                     |    Keywords:            
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Comment (by rodrigo):

 Just to keep this posting updated... I emailed the following to the list
 some days ago.

 Hello,

 I posted before because I had a strange termination error (Termination
 code 11). At first glance I thought it was the linear solver since I had
 just changed it, but now I've acutally isolated this to something else.
 The problem resides in the option: constr_mult_init_max, I changed the
 value from its default of 1000 to 10000. Which I changed at the same time
 I changed the linear solver (my bad, too many changes at once).

 I've tried this with the PARDISO solver, and also with the MA27 solver. In
 both cases when using this altered option I get the termination code 11
 error, but if I use the default constr_mult_init_max value the error does
 not happen (again with both solvers).

 I've also reproduced this with two very different models one for a
 reactive distillation column the other one for a semibatch polymerization
 reactor. I should point out that when I use the default value for the
 option I can get optimal solutions for both models.

 The reason for posting this in the mailing list is that I'm not sure if i
 should open a new ticket, or if I should leave it as is (ticket #14).
 Anyway, I hopefully this will help in the improvement of the code.

 Please email me if more information is needed.

 Thanks,
    Rodrigo Lopez-Negrete (soyrush at gmail.com)

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Ticket URL: <https://projects.coin-or.org/Ipopt/ticket/14>
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