Re: [ojAlgo-user] optimizing from a .mps file

[Anders P. <an...@op...>]

On 16 okt 2009, at 14.25, David Stynes wrote:

> Hello,
> I am trying to use ojAlgo to read from a .mps file and use Linear/ 
> Mixed
> Integer Programming to solve it. Currently the code for this is as  
> follows:
>
> MathProgSysModel mps = MathProgSysModel.makeFromFile(aFile);
> OptimisationSolver os = mps.getDefaultSolver();
> Result rs = os.solve();
>
> This runs correctly and solves the .mps input file as desired.


Should have written somewhere that the MIP solver is new and  
experimental - glad to hear that it solves your problem. How big is it?


> However the
> second line (calling getDefaultSolver()) appears to start an  
> additional
> thread running or something, as the java process does not stop after  
> the
> rest of my code finishes (but the remaining code after this line  
> does get
> executed). Is this intended, and/or am I using it incorrectly and  
> how can I
> use it correctly to prevent the java process continuing to be active
> indefinitely instead of closing?


The MIP solver is multithreaded, but I don't see why any additional  
threads should be created before you call solve().

I have a number of junit tests that basically do what you do. As far  
as I can see they terminate as expected.

Could you step through the code and tell me more precisely where that  
thread is created?


/Anders


> Thanks,
> David
>
>
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