[Cbc] solving time in C++ >> time in Gams
Christos
chtsolak at gmail.com
Wed Oct 10 10:20:39 EDT 2012
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
> <mailto: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 <mailto:chtsolak at gmail.com>
>>> To: dibarra21 at hotmail.com <mailto:dibarra21 at hotmail.com>
>>> CC: cbc at list.coin-or.org <mailto: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
>>>
>>>
>>
>
>
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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 <http://www.iaindunning.com/>
>
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