Re: [Help-glpk] Multithreading/parallelization

[Noli Sicad]

Harley,

I think I missed % in the example.

It should be like this:

cbc myMIPmodel.mod%

In you case:

cbc braemar_prices_dop.mod% -randomCbcSeed 0 -randomSeed 0 -proximity
  on -threads 8 -printi csv -solve -solu braemar_prices_dop.csv

Noli



On 12/18/12, Harley Mackenzie <address@hidden> wrote:
> Noli,
>
> I have nearly got this working. I used the get.glpk script in the third
> party directory and then used your options below to compile the CBC
> program on an Ubuntu 64 bit machine.
>
> I used this compilation command:
>
>   ./configure CFLAGS='-m64 -O3' CC=gcc-4.7 --enable-gnu-packages
>   --enable-cbc-parallel --enable-debug -C --prefix=/usr/local
>   make
>   sudo make install
>
> I attempted to use the following command line with the compiled CBC
> program.
>
>   cbc braemar_prices_dop.mod -randomCbcSeed 0 -randomSeed 0 -proximity
>   on -threads 8 -printi csv -solve -solu braemar_prices_dop.csv
>
>   command line - cbc braemar_prices_dop.mod -randomCbcSeed 0 -randomSeed
>   0 -proximity on -threads 8 -printi csv -solve -solu
>   braemar_prices_dop.csv (default strategy 1)
>   At line 1 param n_revenue >= 0;
>   Unknown image param n_revenue >= 0; at line 1 of file
>   ./braemar_prices_dop.mod
>   Coin0008I  read with -2 errors
>   There were -2 errors on input
>   randomCbcSeed was changed from -1 to 0
>   using time of day randomSeed was changed from 1234567 to 1355826052
>   Option for proximitySearch changed from off to on
>   threads was changed from 0 to 8
>   Option for printingOptions changed from normal to csv
>   ** Current model not valid
>   ** Current model not valid
>   No match for braemar_prices_dop.csv - ? for list of commands
>   Total time (CPU seconds):       0.00   (Wallclock seconds):       0.00
>
> The first line is a standard mathprog command:
>
>   param n_revenue >= 0;
>
> So it would seem that the mathprog interface is not being used for the
> model as this is pretty straight forward mathprog line and the whole
> model runs on GLPK. The mod file has the structure:
>
>   code
>   solve
>   date
>   end
>
> All in the one file called braemar_prices_dop.mod.
>
> There wasnt any command in the ./configure step to include glpk - is
> anything required? Or is there a command line option needed for CBC to
> use mathprog to process the model?
>
> Any help or directions to any documentation would be greatly
> appreciated. How did you work out how to set up CBC for mathprog?
>
> Regards,
>
> Harley
>
> On Tue, Dec 18, 2012, at 8:21, Noli Sicad wrote:
>> Hi Harley,
>>
>> > I assume that you are using mathprog and then producing an MPS file for
>> > CBC, and as you point out, you can't then use the mathprog output
>> > statements and would have to process the results some other way.
>>
>> No, I run my MIP MathPog model in CBC solver. I compiled CBC with
>> MathProg parser in Mac OS X. CBC has third parties "add-ons" and
>> GLPK/MahtProg is one of these add-ons packages. Before you compile CBC
>> get glpk first, if you like to include support of MathProg parser.
>>
>> CBC with MathProg parser support just ignores those MathProg scripts
>> after the solve statement.
>>
>> Yes, you can use MPS and CPLEX LP format as input for the CBC solver.
>>
>> > Are you able to share the details on how you make this work? I presume
>> > CBC is the COIN-OR MIP solver. How is easy is CBC to work with and how
>> > do you handle the output processing?
>>
>> First download the CBC trunk. Yes, it is the COIN-OR MIP solver.
>>
>> CBC trunk has threads support with proximity search heuristic
>> algorithm. Before compiling run the "get.glpk" script in the third
>> parties folder > glpk folder. The default glpk is glpk-4.45, just use
>> it. It does not interfere with your installed glpk (glpk-4.47).
>>
>> Compile with  --enable-cbc-parallel
>>
>> For linux and Mac OS X.
>>
>> #####
>>
>> ./configure CFLAGS='-m64 -O3' CC=gcc-4.7 --enable-gnu-packages
>> --enable-cbc-parallel --enable-debug -C --prefix=/usr/local
>>
>> #####
>>
>> For Windows OS, it has support for various version of MSVisualStudio.
>> Have a look at the MSVisualStudio folder in CBC after you download.
>>
>> Run the CBC solver with -print csv to get the solution.
>>
>> e.g.
>>
>> #####
>>
>> > cbc myMIP.mod -randomCbcSeed 0 -randomSeed 0 -proximity on -threads 8
>> > -printi csv -solve -solu solution_math_period1-10p1.csv
>>
>> #####
>>
>> Noli
>
>
> --
> -----
>   Dr. Harley Mackenzie
>   HARD software
>
>   address@hidden
>   www.hardsoftware.com
>   + 61 3 5222 3435
>