[Ipopt] slow convergence!!!

[Juan Carlos Lopez Alfonso]

Hi all,

I have changed the stop conditions and I am sure that the
implementation of my algorithm is correct. I have tested the results
with a small problems and the results are correct, but when I execute
my big problem the convergence is very slow and I dont know the
reason. Is very difficult to test my algorithm, and for example I have
one of them running for more than 2 days.

someone can give any idea to solve this problem? Is normal this behavior?
Best regards and thank you in advance
Juan Carlos

iter    objective    inf_pr   inf_du lg(mu)  ||d||  lg(rg) alpha_du alpha_pr  ls
 530  1.7544440e+01 0.00e+00 2.92e-04  -5.7 2.24e-03  -1.7 1.00e+00 1.00e+00H  1
 531  1.7544442e+01 0.00e+00 3.46e-04  -5.7 3.14e-03  -1.2 1.00e+00 1.00e+00H  1
 532  1.7544439e+01 0.00e+00 1.40e-03  -5.7 3.58e-01  -1.7 1.96e-01 3.46e-03h  4
 533  1.7544440e+01 0.00e+00 1.40e-04  -5.7 2.10e-03  -1.3 1.00e+00 1.00e+00h  1
 534  1.7544436e+01 0.00e+00 1.07e-03  -5.7 5.01e-02  -1.8 1.00e+00 5.66e-02h  3
 535  1.7544435e+01 0.00e+00 1.14e-04  -5.7 8.55e-04  -1.3 1.00e+00 1.00e+00h  1
 536  1.7544667e+01 0.00e+00 4.84e-03  -5.7 5.97e-02  -1.8 1.73e-01 1.00e+00H  1
 537  1.7544666e+01 0.00e+00 4.80e-03  -5.7 3.40e-01  -1.4 8.88e-01 5.66e-06f 16
 538  1.7544666e+01 0.00e+00 4.78e-03  -5.7 3.76e-02  -1.0 1.00e+00 3.05e-05h 16
 539  1.7544666e+01 0.00e+00 4.27e-03  -5.7 5.91e-01  -1.4 9.59e-01 1.66e-06f 17
iter    objective    inf_pr   inf_du lg(mu)  ||d||  lg(rg) alpha_du alpha_pr  ls
 540  1.7544666e+01 0.00e+00 4.43e-03  -5.7 3.71e-02  -1.0 1.00e+00 3.81e-06h 19
 541  1.7544433e+01 0.00e+00 1.05e-02  -5.7 4.15e-01  -1.5 9.01e-01 1.59e-01f  1
 542  1.7544417e+01 0.00e+00 2.55e-03  -5.7 4.53e-03  -2.0 7.36e-01 1.00e+00h  1
 543  1.7544489e+01 0.00e+00 3.19e-03  -5.7 2.71e-02  -1.5 2.83e-01 1.00e+00H  1
 544  1.7544425e+01 0.00e+00 1.45e-03  -5.7 2.38e-02  -1.1 1.00e+00 1.00e+00H  1
 545  1.7544458e+01 0.00e+00 1.17e-03  -5.7 1.90e-02  -1.6 4.67e-01 1.00e+00H  1
 546  1.7544411e+01 0.00e+00 1.11e-03  -5.7 1.50e-02  -1.2 1.00e+00 1.00e+00H  1
 547  1.7544411e+01 0.00e+00 7.77e-04  -5.7 2.75e-02  -1.6 2.64e-01 7.81e-03h  8
 548  1.7544486e+01 0.00e+00 1.77e-03  -5.7 1.76e-02  -1.2 6.68e-01 1.00e+00H  1
 549  1.7544436e+01 0.00e+00 5.11e-04  -5.7 7.93e-03  -0.8 1.00e+00 1.00e+00F  1
iter    objective    inf_pr   inf_du lg(mu)  ||d||  lg(rg) alpha_du alpha_pr  ls
 550  1.7544432e+01 0.00e+00 1.13e-03  -5.7 8.06e-03  -1.3 9.61e-01 1.00e+00h  1
 551  1.7544423e+01 0.00e+00 2.96e-04  -5.7 9.29e-03  -0.8 1.00e+00 3.11e-01h  2
 552  1.7544433e+01 0.00e+00 7.06e-04  -5.7 4.22e-03  -1.3 1.00e+00 1.00e+00h  1
 553  1.7544418e+01 0.00e+00 1.03e-03  -5.7 5.19e-03  -0.9 1.00e+00 1.00e+00H  1
 554  1.7544422e+01 0.00e+00 5.65e-04  -5.7 3.19e-03  -1.4 6.67e-01 1.00e+00h  1
 555  1.7544418e+01 0.00e+00 1.58e-04  -5.7 7.00e-04  -0.9 1.00e+00 1.00e+00h  1
 556  1.7544422e+01 0.00e+00 3.76e-04  -5.7 1.42e-03  -1.4 1.00e+00 1.00e+00H  1
 557  1.7544412e+01 0.00e+00 6.76e-04  -5.7 2.98e-03  -1.0 1.00e+00 1.00e+00H  1
 558  1.7544422e+01 0.00e+00 8.57e-04  -5.7 3.14e-03  -1.5 9.33e-01 1.00e+00F  1
 559  1.7544418e+01 0.00e+00 7.74e-04  -5.7 3.10e-02  -1.0 6.52e-01 3.92e-02f  3