[CoinMp] New Patch for 1.4.0 CoinMP

[Stuart Mitchell]

It has taken me all morning but I have the patch file for this now

This Patch takes contributions from Larry Taylor, Ron Frowd and Myself and
1) corrects the setting of some parameters that are real not ints
2) changes some solver options for better performance
3) adds branch priorities
4) fixes a bug with the msgcallback
5) puts in an option for MaxSeconds
6) puts in an option for FractionGap
7) outputs better status messages from cbc
8) is able to write MPS files for integer problems

Can we PLEASE have this integrated with the code as I need it for 
pulp-or which is dependent on this solver.

Stu


Stuart Mitchell wrote:
> hey there is a version 1.4.0 that fixes this problem
> 
> Finally!!!
> 
> There are still the other issues that we identified.
> 
> So I am building a patch for this as we speak
> 
> Stu
> 
> 
> Rod Frowd wrote:
>> Ming:
>>
>> I posted this several years ago:
>>
>> "I have been running the CBC MIP repetitively from CoinMP.dll and it 
>> seems to be leaking memory and growing in size.
>>
>> I have added a delete of the cbc object into CoinMP.cpp as follows. It 
>> looks like this will also delete the cut generator objects created as 
>> its destructor includes deletion of the cut generators.
>>
>> SOLVAPI int CoinUnloadProblem(HPROB hProb)
>> {
>>   PCOIN pCoin = (PCOIN)hProb;
>>      if (pCoin) {
>>        delete pCoin->clp;
>>        if (pCoin->RowLower) free(pCoin->RowLower);
>>        if (pCoin->RowUpper) free(pCoin->RowUpper);
>>        if (pCoin->IsInt) free(pCoin->IsInt);
>>        delete pCoin->cbc;
>>        pCoin->cbc = NULL;
>>    }
>>    free(pCoin);
>>    pCoin = NULL;
>>    return SOLV_SUCCESS;
>> }
>>
>> "
>>
>> And I think Stuart Mitchell from NZ also raised a ticket about this.
>>
>> Rod
>>
>> ming lu wrote:
>>>> Hi All,
>>>>
>>>> It looks that CoinUnloadProblem doesn't release resource correctly.
>>>> The cbc was not released, this causes a huge memory leak problem. Also
>>>> following members are not explicitly released:
>>>>
>>>>                                ClpSolve *clp_presolve;
>>>>                                OsiClpSolverInterface *osi;
>>>>                                CBMessageHandler *msghandler;
>>>>                                CBIterHandler *iterhandler;
>>>>                                CBNodeHandler *nodehandler;
>>>>
>>>>                                CglProbing *probing;
>>>>                                CglGomory *gomory;
>>>>                                CglKnapsackCover *knapsack;
>>>>                                CglOddHole *oddhole;
>>>>                                CglClique *clique;
>>>>                                CglLiftAndProject *liftpro;
>>>>                                CglSimpleRounding *rounding;
>>>>
>>>> Could someone take a look?
>>>>
>>>> Thanks,
>>>> Ming
>>>>
>>>>     
>>>
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> 

-- 
___________________________________
Dr Stuart Mitchell
Research Fellow
Light Metals Research Centre (LMRC)
University of Auckland
Private Bag 92019
Auckland
New Zealand

Ph (wk)  +64 9 3737599 ext 84867
    (ddi) +64 9 9234867
    (fax) +64 9 3737925
    (mb)  +64 21 441331
___________________________________

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