[Ipopt] IPOPT with AMPL VS IPOPT with native C++

[Nicolas Derhy]

Thank your for your answer.
Then, I think I will use AMPL in my case !


On Fri, Jul 12, 2013 at 8:07 PM, Joel Andersson <
joel.andersson at esat.kuleuven.be> wrote:

> Dear Nicolas,
>
> The main benefit with using AMPL or other modeling languages is the exact
> and (typically) very efficient calculation of first and second order
> derivative information. Anyway, even if you have some other efficient way
> of calculating derivatives, changes are that it won't matter much for the
> speed. The reason for this is that for large-scale problems, most time is
> typically spent in the linear solver and not in the derivative
> calculations. This depends on how sparse the problem is, though.
>
> Greetings!
> Joel
>
> P.S.: You might also want to have look at CasADi (www.casadi.org). Like
> AMPL, it is also able to calculate derivatives very efficiently.
>
>
>
> 2013/7/12 Nicolas Derhy <nicolas.derhy at gmail.com>
>
>>  Hi everybody,
>>
>> I did not find information in the documentation regarding the IPOPT
>> performance.
>> I have a lot of small instances to solve and I would prefer to use AMPL
>> because I won't have to write new C++ code.
>>
>> However I do not have any idea of the perfomance gap between these two
>> approaches. I do not know if AMPL calculates jacobian, hessian,... with
>> efficiency and how AMPL and IPOPT communicates (via file, memory ?).
>>
>> Do you have any advice from you IPOPT experience ?
>>
>> Best regards,
>>
>> Nicolas
>>
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>>
>>
>
>
> --
> Joel Andersson, PhD Student
> Electrical Engineering Department (ESAT-SCD), Room 05.11,
> K.U.Leuven, Kasteelpark Arenberg 10 - bus 2446, 3001 Heverlee, Belgium
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>
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>
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