[Coin-discuss] AIX Ampl->nl->Linux->cbc->sol->AIX Ampl not working

[Andreas Waechter]

Hi,

One thing that could help is to generate the .nl file in ASCII format and 
not as binary file (if you are not doing that already).  You do that with

write gfilename;

to write the filename.nl file.

Maybe that will also instruct the solver executable to write the .sol file 
as ASCII.

Andreas

On Fri, 22 Sep 2006, Kendall Bailey wrote:

> I have done almost exactly what you are describing.  I'm currently
> using CPLEX as the solver on Linux ( AMD Opteron hardware ).  However,
> I have done the same thing with an AMPL solver I wrote which utilizes
> the Osi interfaces, and thus Cbc, Clp, Symphony, glpk, ... to do the
> actual solve step.  I've had no endian troubles at all.  I'm using
> AMPL on AIX just as you are.  Sorry I can't help with the Cbc program
> itself.  I've planned to release the solver driver I wrote for some
> time, but priorities changed.  I can send it to you if you'd like to
> see it.
>
> Kendall
>
>
> On 9/22/06, Derek Jones <scunacc at yahoo.com> wrote:
>> Dear folks,
>> 
>> What I'm trying to achieve may be a non-started because of endian /
>> alignment issues, but I'm not sure.
>> 
>> I want to do this:
>> 
>> Have AMPL generate a .nl file, call a wrapper program instead of the
>> solver, send the .nl file via the wrapper to Linux, where I will solve
>> the problem using cbc file.nl -AMPL, then get the .sol file back on AIX.
>> 
>> I have problems.
>> 
>> Linux can't seem to write the .sol file properly. It *appears* to solve
>> OK, but then bombs in the writesol.c file in getsufhead.
>> 
>> I've traced thru, and there appears to be unreadable pointer memory
>> inside the current "d" variable.
>> 
>> Anyhow, has anyone got the ampl solver stuff to work OK on Linux? If so,
>> what compile options did you use?
>> 
>> Has anyone faced the above problem?
>> 
>> Has anyone else :-) tried anything as crazy as the subject line at all ?
>> 
>> Kind regards
>> 
>> Derek Jones.
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