[Ipopt] Infinite Loop Problem With Precompiled Ipopt DLL v3.8.1

[Teeter, Chuck]

Hi Marcel,

I know that in the past I have been able to use the posted binaries, so
I am a little surprised as well.  I probably have a couple of other
differences in my setup.  I do compile HSL with MA27 and MA57, and I use
the Intel MKL Blas and Lapack libraries.  I am also now using the Intel
C++ compiler (11.1.065) for most of my work within VS2008, and I used
this compiler to build the AIMMS link and HSL libraries as well.  I also
use Intel Fortran (11.1.065).

When I tried to use the posted DLLs this morning, I simply replaced my
working version of Ipopt38.dll with the posted version, being careful to
keep Win32 and x64 executables separate on my Windows 7 laptop.  I was
also careful to use the "Release" versions of the DLLs.  Then, when I
attempted to solve a problem, AIMMS immediately returned with "na" for
my objective value.  I repeated this for all of my installed linear
solvers (MUMPS, MA27, and MA57) and got the same results in both the
Win32 and x64 versions of AIMMS.  When I switched back to the DLLs I had
built previously, everything again worked normally.

The only thing I can think of is that maybe the posted Ipopt38 DLLs are
not binary compatible with my installed versions of libhsl.dll and
libAIMMSIpopt.dll, which as I mentioned were both built using the Intel
C++ compiler.  I know they *should* be binary compatible, but maybe
not...

Perhaps a more appropriate test would be to use both the posted binaries
for libAIMMSIpopt.dll and Ipopt38.dll together, instead of mixing the
products of different compilers.  I will try this and the binaries that
you've built, and let you know what happens.



   

-----Original Message-----
From: ipopt-bounces at list.coin-or.org
[mailto:ipopt-bounces at list.coin-or.org] On Behalf Of Marcel Roelofs
Sent: Wednesday, May 19, 2010 4:09 PM
To: ipopt at list.coin-or.org
Subject: Re: [Ipopt] Infinite Loop Problem With Precompiled Ipopt DLL
v3.8.1

Hi Chuck,

I'm a little bit surprised to read this. As the one responsible for
building the Ipopt DDLs, we've extensively tested them specifically with
AIMMS before posting them, and encountered no problems, neither with
MUMPS nor with HSL. So, my question would be what is specific to your
setup that prevent the posted DLLs from working for you. Do you still
remember what kind of errors you encountered? The only difference I can
come up with so far is, assuming you're using HSL, that you used VS 2008
to compile the HSL sources.

BTW. The v8-ifort project in the Ipopt trunk now also contains a
configuration for linking against the MKL Blas and Lapack libraries. At 

	
ftp://ftp.aimms.com/pub/Download/Private/Ipopt/IpOpt-pre-3.8.2.7z

you can find the pre-3.8.2 binaries as I compiled them on my machine
using VS2005/Ifort 11.1.060. Could you verify whether these work for you
or not, and if not, what is the problem? In the end, I'd like to make
life for Ipopt users on Windows as convenient as possible by providing
DLLs that actually work.

Cheers,

Marcel Roelofs
Paragon Decision Technology

> Hi Chris,
>  
> I haven't encountered this specific issue, but I can say that the 
> Windows Ipopt 3.8.1 DLLs that are posted do not work for me when I use

> them with the AIMMS modeling system (uses C++ interface, though).
When
> I build the same DLLs from source with VS2008, I have no problems.
Have
> you tried using any of the other binaries or building the DLLs
yourself?

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