[Ipopt] Release/Debug mode

[Raquel Guardia]

Hi all,

 

I am trying to solve a NLP problem with IPOPT (865 variables and 530
constraints). I am using the the binary (win32) DLL.

If I run the program in debug mode, all is right. The problem comes when I
try to execute it  in release mode. In release, IPOPT gives me the optimal
solution without problems, but this solution differs depending on the place
where it's executed.

 

For example, if I execute the code in my desktop, IPOPT finds the optimal
solution in 193 iterations:

 


iter    objective    inf_pr   inf_du lg(mu)  ||d||  lg(rg) alpha_du alpha_pr
ls

   0 1.8990519e+003 2.53e+006 8.73e+001   0.0 0.00e+000    -  0.00e+000
0.00e+000   0

   1 8.0615445e+004 2.53e+006 1.14e+002   5.5 1.68e+006    -  3.45e-008
1.52e-006f  1

   2 8.4984098e+004 2.53e+006 1.14e+002   3.7 1.63e+006    -  9.21e-007
3.44e-006f  1

   3 1.5133245e+005 2.53e+006 2.79e+002   4.3 1.68e+006    -  2.15e-006
1.32e-005f  1

   4 2.8394936e+005 2.53e+006 2.94e+002   3.9 1.69e+006    -  1.38e-005
3.96e-005f  1

   5 2.9204821e+005 2.53e+006 2.93e+002   4.8 1.01e+006    -  2.55e-006
2.71e-006f  1

   6 8.2596406e+008 2.51e+006 1.02e+006   6.1 1.89e+006    -  1.72e-006
8.16e-003f  1

   .

 

Number of Iterations....: 193

 

                                   (scaled)                 (unscaled)

Objective...............:  3.1208657806952629e+005   6.1431434113783743e+006

Dual infeasibility......:  3.5501585875953514e-009   6.9881676654085783e-008

Constraint violation....:  4.6566128730773926e-010   4.6566128730773926e-010

Complementarity.........:  1.0000000696763270e-011   1.9684101371515826e-010

Overall NLP error.......:  3.5501585875953514e-009   6.9881676654085783e-008

 

Number of objective function evaluations             = 355

Number of objective gradient evaluations             = 180

Number of equality constraint evaluations            = 355

Number of inequality constraint evaluations          = 0

Number of equality constraint Jacobian evaluations   = 196

Number of inequality constraint Jacobian evaluations = 0

Number of Lagrangian Hessian evaluations             = 0

Total CPU secs in IPOPT (w/o function evaluations)   =     24.172

Total CPU secs in NLP function evaluations           =     48.125

 

 

But if I execute the same code in C:/, the number of iterations and the
results are different:

 

iter    objective    inf_pr   inf_du lg(mu)  ||d||  lg(rg) alpha_du alpha_pr
ls

   0 1.8990519e+003 2.53e+006 8.73e+001   0.0 0.00e+000    -  0.00e+000
0.00e+000   0

   1 8.0615445e+004 2.53e+006 1.14e+002   5.5 1.68e+006    -  3.45e-008
1.52e-006f  1

   2 8.4984098e+004 2.53e+006 1.14e+002   3.7 1.63e+006    -  9.21e-007
3.44e-006f  1

   3 1.5133245e+005 2.53e+006 2.79e+002   4.3 1.68e+006    -  2.15e-006
1.32e-005f  1

   4 2.8394985e+005 2.53e+006 2.94e+002   3.9 1.69e+006    -  1.38e-005
3.96e-005f  1

   5 2.9204809e+005 2.53e+006 2.93e+002   4.8 1.01e+006    -  2.55e-006
2.71e-006f  1

   6 8.2597073e+008 2.51e+006 1.02e+006   6.1 1.89e+006    -  1.73e-006
8.16e-003f  1

.

 

Number of Iterations....: 111

 

                                   (scaled)                 (unscaled)

Objective...............:  3.1208657753133564e+005   6.1431434007845754e+006

Dual infeasibility......:  9.7656250000000000e-004   1.9222753906250035e-002

Constraint violation....:  9.9999999999999969e-009   9.9999999999999969e-009

Complementarity.........:  1.1550769498483705e-011   2.2736650188510352e-010

Overall NLP error.......:  9.9999999999999969e-009   1.9222753906250035e-002

 

Is normal this behavior?

I have the same problem with versions 3.9.2 and 3.10.1.

 

Best regards and thank you in advance

 

Raquel  

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