[Cbc] solving time in C++ >> time in Gams

Wed Oct 10 10:21:29 EDT 2012

Compile everything in release mode - both the libraries and your project.

- Iain

On Wed, Oct 10, 2012 at 10:20 AM, Christos <chtsolak at gmail.com> wrote:

>  Yes you both were right. I have compiled libraries in debug mode.
> Thank you.
>
> Now i compiled them in release mode, but i get 177 same errors:
>
> error LNK2038: mismatch detected for '_ITERATOR_DEBUG_LEVEL': value '0'
> doesn't match value '2' in test.obj
>
> What's this?
> (i am trying to compile project in debug mode)
>
>
>
> On 10/10/2012 16:59, Iain Dunning wrote:
>
> I wrote that guide.
> Is it possible you are building your program in "Debug" mode? If the lib
> files are large, it suggests they are being built with debugging
> information...
> Changing to "Release" mode could create speed ups of that order.
>
>  Cheers,
> Iain
>
> On Wed, Oct 10, 2012 at 4:39 AM, Christos <chtsolak at gmail.com> wrote:
>
>>  In order to help you help me i compiled my code with this method:
>> https://projects.coin-or.org/Cbc/wiki/VSSetup
>>
>> And as i can see lib files from repository are much smaller then these
>> created with the above method.
>>
>> Is this matter?
>>
>>
>> On 9/10/2012 23:00, Christos wrote:
>>
>> Very useful info!
>>
>> I downloaded Cbc-2.7.5-win64-intel11.1 and run cbc.exe in the bin folder.
>> I used 2 methods-commands for solving, branchAndBound and solve.
>>
>> They both solved it almost 10 times faster!!!
>>
>> Now, to come to a solution, i need to know what's the differnece between
>> solving with stand alone and simply by calling the solver via my code which
>> was implemented in MS visual studio 2010..
>>
>> If you can help me with this, i would have find the solution to my big
>> problem!
>> I am waiting impatiently for your words.
>>
>> Thank you!
>>
>> On 9/10/2012 22:26, David Ibarra Gómez wrote:
>>
>>  You can find the CBC binaries here:
>> https://projects.coin-or.org/CoinBinary or (here
>> http://www.coin-or.org/download/binary/Cbc/). You can test different
>> versions
>>
>>  From the shell you can call the executable binary. Then you just:
>>
>>  1. Import MPS file by just typing "import mpsfilename.mps"
>> 2. and then you can solve it just typing "branchAndCut"
>>
>>  Then compare the time to solve with the API.
>>
>>  A random google search to find a "recipe" could be (at the end of page
>> 6): http://wpweb2.tepper.cmu.edu/fmargot/coin/proj5.pdf
>>
>>  Regards
>>
>>
>>
>>  ------------------------------
>> Date: Tue, 9 Oct 2012 20:50:04 +0300
>> From: chtsolak at gmail.com
>> To: dibarra21 at hotmail.com
>> CC: cbc at list.coin-or.org
>> Subject: Re: [Cbc] solving time in C++ >> time in Gams
>>
>> i have the latest version, 2.7.7....
>>
>> I solve it by using the default cbc solver, (i am not getting involved in
>> the solver) with this way:
>>
>> *solver1.loadProblem(numcols, numrows, start, index, value, collb,
>> colub, obj, rowlb, rowub);
>> CbcModel model(solver1);
>> CbcMain0(model);
>> const char * argv2[]={"DAS","-solve","-quit"};   **
>> CbcMain1(3,argv2,model);    *
>>
>> So, i do not think that it's ommiting the presolve step, am i wrong?
>>
>> Where can i find the latest version, and how can i load an mps file?
>>
>> Thank you
>>
>> On 9/10/2012 20:42, David Ibarra Gómez wrote:
>>
>>  Hi,
>>
>>  there are several things that can cause this:
>>
>>
>>    - different solvers version,
>>    - solving is a complex task: presolve (cuting planes, heuristics,
>>    ...) and then branch and bound (cut). If you omit the first part or
>>    you do not do exactly the same steps result could be different.
>>
>>
>>  Did you try to solve using CBC CLI (stand alone executable) ?
>>
>>  Regards
>>
>>  ------------------------------
>> Date: Tue, 9 Oct 2012 12:16:49 +0300
>> From: chtsolak at gmail.com
>> To: cbc at list.coin-or.org
>> Subject: [Cbc] solving time in C++ >> time in Gams
>>
>> Hi all again,
>>
>> I have 1  question for you, if i solve it, i won't bother you again :-P
>>
>> I am using cbc in order to make an executable via MS visual studio which
>> solves a model.
>> In order to solve it, takes 60 mins
>>
>> I have made the same problem with GAMS and solved it in 30 secs, 120
>> times faster!!
>>
>> Is it because of an error in modeling or due to the different interface?
>> (exe-GAMS)
>>
>> Why is there this enormous difference?
>>
>>
>> Thank you in advance.*
>> *
>> *
>>
>> *
>> _______________________________________________ Cbc mailing list
>> Cbc at list.coin-or.org http://list.coin-or.org/mailman/listinfo/cbc
>>
>>
>>
>>
>>
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>>
>
>
>  --
> *Iain Dunning*
> PhD Student <http://orc.scripts.mit.edu/people/student.php?name=idunning> / MIT
> Operations Research Center <http://web.mit.edu/orc/www/>
>  www.iaindunning.com
>
>
>

-- 
*Iain Dunning*
PhD Student <http://orc.scripts.mit.edu/people/student.php?name=idunning> / MIT
Operations Research Center <http://web.mit.edu/orc/www/>
www.iaindunning.com
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