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

[Christos]

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 <mailto:chtsolak at gmail.com>
>>     To: cbc at list.coin-or.org <mailto: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 <mailto:Cbc at list.coin-or.org>
>>     http://list.coin-or.org/mailman/listinfo/cbc
>>
>>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/cbc/attachments/20121010/1171322c/attachment.html>