[Ipopt] ERROR 20 IN ROUTINE g2dHesRowStruct: the NL instruction stack not empty

[Martin Schmidt]

Hi,

so I understand you right that this is neithor a problem with my 
GAMS-Code nor with Ipopt but with the GAMS-Ipopt-Interface?

Martin

Am 22.09.2011 12:56, schrieb Stefan Vigerske:
> Hi,
>
> the error comes from the GAMS hessian evaluation routines.
> (and I think you stumbled about it some time ago before?)
>
> One workaround could be to enable Ipopts hessian approximation.
>
> But updating to a newer GAMS version would be best.
> GAMS >= 23.4 uses a different code for computing the hessian, so the old
> one from 23.3 is not maintained anymore.
> Since GAMS 23.7, Ipopt is also linked against the multithread version of
> the MKL, maybe that can help to bring some speedup.
>
> Stefan
>
>> I have a curious problem I do not understand. I have a NLP model written
>> in GAMS (v. 23.3.3) which I try to solve with Ipopt (v. 3.8).
>>
>> Thereby I get the following error message:
>>
>> ************************************************************************
>> --- Starting compilation
>> --- tmp_S5iQo3(137150) 19 Mb
>> --- Starting execution: elapsed 0:00:01.036
>> --- tmp_S5iQo3(92420) 20 Mb
>> --- Generating NLP model HSsHM_V10_model
>> --- tmp_S5iQo3(92422) 31 Mb
>> --- 12,388 rows 22,262 columns 52,928 non-zeroes
>> --- 176,655 nl-code 18,489 nl-non-zeroes
>> --- tmp_S5iQo3(92422) 29 Mb
>> --- Executing IPOPTD: elapsed 0:00:05.601
>> --- tmp_S5iQo3(92422) 29 Mb
>>
>> GAMS/IpoptD (Ipopt Library 3.8)
>> written by A. Waechter
>> ERROR 20 IN ROUTINE g2dHesRowStruct: the NL instruction stack not empty
>> as expected
>> --- Restarting execution
>> --- tmp_S5iQo3(92422) 16 Mb
>> --- Reading solution for model HSsHM_V10_model
>> --- tmp_S5iQo3(137149) 16 Mb
>> --- Putfile nlp_results
>> /home/euklid/willert/work/egt/lamatto/tmp_S5iQo3.dat
>> *** Status: Normal completion
>> --- Job tmp_S5iQo3 Stop 09/21/11 10:04:34 elapsed 0:00:09.785
>> ************************************************************************
>>
>> Where is the problem? And how can I resolve it?
>>
>> Tanks in advance,
>> Martin Schmidt
>>
>
>
>


-- 
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- Dipl.-Math. Martin Schmidt		  -
- Institut für Angewandte Mathematik	  -
- AG Algorithmische Optimierung		  -
- Leibniz Universität Hannover		  -
- Welfengarten 1, D-30167 Hannover	  -
- Tel.: 0511-762-3873, Fax: 0511-762-3988 -
- E-Mail: mschmidt at ifam.uni-hannover.de	  -
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