[Ipopt] Error Code Interpretation

[Mostafa.B]

Hi Kurt,

Thanks for the help. It shouldn't be the maximum iterations as I am passing
max_iter=1000000. I have 64 binaries for IPOPT and plenty of RAM so
hopefully Memory shouldn't be an issue either. My guess is that the error
code is associated with Error_In_Step_Computation or maybe
Restoration_Failed!
But this is only a guess, so my search still continues!

Regards,
Mostafa

On 1 February 2018 at 11:53, Majewski, Kurt <kurt.majewski at siemens.com>
wrote:

> Hi Mostafa,
>
>
>
> in IpReturnCodes_inc.h you can find
>
>
>
> enum ApplicationReturnStatus
>
>   {
>
>     Solve_Succeeded=0,
>
>     Solved_To_Acceptable_Level=1,
>
>     Infeasible_Problem_Detected=2,
>
>     Search_Direction_Becomes_Too_Small=3,
>
>     Diverging_Iterates=4,
>
>     User_Requested_Stop=5,
>
>     Feasible_Point_Found=6,
>
>
>
>     Maximum_Iterations_Exceeded=-1,
>
>     Restoration_Failed=-2,
>
>     Error_In_Step_Computation=-3,
>
>     Maximum_CpuTime_Exceeded=-4,
>
>     Not_Enough_Degrees_Of_Freedom=-10,
>
>     Invalid_Problem_Definition=-11,
>
>     Invalid_Option=-12,
>
>     Invalid_Number_Detected=-13,
>
>
>
>     Unrecoverable_Exception=-100,
>
>     NonIpopt_Exception_Thrown=-101,
>
>     Insufficient_Memory=-102,
>
>     Internal_Error=-199
>
>   };
>
>
>
> I would guess that in your case the original return code was casted to an
> unsigned 8 Bit number,
>
> such that the number 255 you observe might belong to
> Maximum_Iterations_Exceeded=-1.
>
>
>
> Regards,
>
>
>
> Kurt Majewski
>
>
>
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>
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>
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>
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>
> *Von:* Ipopt [mailto:ipopt-bounces at coin-or.org] *Im Auftrag von *Mostafa.B
> *Gesendet:* Thursday, February 01, 2018 12:37 PM
> *An:* ipopt at list.coin-or.org
> *Betreff:* [Ipopt] Error Code Interpretation
>
>
>
> Hi All,
>
>
>
> I am calling IPOPT to solve a problem formulated in Pyomo. However after
> quite a while of the solver running (and reallocating memory), it stops and
> returns solver error code 255. I was wondering what does this mean? and if
> there is any document where I could read what every error code means?
>
>
>
> Regards,
>
> Mostafa
>
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