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

[John J Forrest]

Derek,

Thanks for sending me the example which caused a segmentation fault..

The problem was to do with one of the status arrays.  For integer problems 
these are not used by Cbc/Ampl but Ampl still remembered them and tried to 
read the array in writesol.  I don't know enough about Ampl to tell it not 
to look at these arrays so I have changed the code to leave the arrays 
anyway.  Your problem had many more columns than rows so maybe that is why 
other people have not noticed the bug.

Hopefully fixed now.

John



Derek Jones <scunacc at yahoo.com> 
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09/22/2006 12:43 PM
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[Coin-discuss] AIX Ampl->nl->Linux->cbc->sol->AIX Ampl not working






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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