[Symphony] Symphony in a shared-memory architecture on Windows

[Ashutosh Mahajan]

Aiko,

If you compiled Symphony without any OpenMP options, then it is unlikely that
there is a problem in Symphony. Do you also see the problem when you run with
only one thread? In that case, there is a bug in Symphony. 
Or do you see it only when running multiple threads? Then there could be a
problem in the way you call Symphony. Could you share the code if so?

--
regards
Ashutosh Mahajan
http://coral.ie.lehigh.edu/~asm4

On Fri, Jan 14, 2011 at 10:38:39AM +0100, Aiko Vogelsang wrote:
>    Hello everybody,
> 
> 
> 
>    I have some questions concerning the usage Symphony (5.3.1) in a parallel
>    environment in Visual Studio 2008 Pro.
> 
> 
> 
>    In my program there are some calculations done. Within each of these loops
>    Symphony is called to solve a MILP. To build up the MILP-model in every
>    loop I use the methods of CoinModel.
> 
>    If I run my code in a sequential mode everything works fine.
> 
>    But running the program in a shared-memory environment by integrating
>    OpenMP commands around the loop causes failures. Unfortunately I get heap
>    corruption errors in these cases. Concerning this problem I found in the
>    Symphony 5.2.3 manual that the solver runs on Windows systems only in a
>    sequential mode. Is this also effective for the latest versions of
>    Symphony?
> 
>    In the same manual there's a hint that it should be easy to run Symphony
>    in parallel on Windows systems if PVM will work. I thought that PVM is
>    needed for distributed architectures or do I need it for my case?
> 
> 
> 
>    Furthermore, I'm wondering because I only separate the "main" loop into
>    pieces and not the Symphony calculations. According to my understanding
>    they're still done in a sequential mode (one Symphony instance for every
>    processor core) or am I wrong here?
> 
> 
> 
>    The last question would be if anybody has some experience with this
>    problem using Visual Studio and if anybody has a tip for me to solve this
>    problem? That would be very helpful!
> 
> 
> 
>    Many thanks in advance!
> 
> 
> 
>    Best regards
> 
>    Aiko

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