[Cmpl] Problems with other solvers

Wed Mar 24 07:23:36 EDT 2021

Hi Hendrik,

Thank you for being interested in CMPL.

In Cmpl 1.12 is actually a bug regarding Gurobi. Please copy the files you can download from  <https://nextcloud.th-wildau.de/nextcloud/index.php/s/Y2S5jWenQAFkT4q> https://nextcloud.th-wildau.de/nextcloud/index.php/s/Y2S5jWenQAFkT4q  in Cmpl/bin to exchange the existing files.  

For Cplex and Scip you need to edit Cmpl/bin/cmpl.opt. The following works on my system:

CbcPath =

GlpkPath =  

ScipFileName = scip.exe

CplexFileName = \Program Files\IBM\ILOG\CPLEX_Studio1210\cplex\bin\x64_win64\cplex.exe

I have copied the scip files into Cmpl/bin (scip.exe, libscip.dll, tbb.dll). Therefore, the Scip entry is only -> scip.exe.

With the Gurobi patch and the entries in cmpl.opt, your problem ran without problems on my system.

To generate a Free Mps file you need to use the command line argument -fm instead -m. -m is for classical MPS which cannot proceed longer names for columns and rows.

Please let me know, whether my hints work for you.

Thanks,

Mike

Von: Cmpl <cmpl-bounces at coin-or.org> Im Auftrag von Hendrik Titgemeyer
Gesendet: 24 March 2021 09:02
An: cmpl at list.coin-or.org
Betreff: [Cmpl] Problems with other solvers

Hi,

I have problems solving a VRPTW with Gurobi, CPLEX, SCIP and GLPK. My goal is to compare these solvers for which reason the CMPL package is perfect. I use the Coliop IDE to create the model and I have already solved the problem with the CBC solver, so it should be feasible.

When I use Gurobi, the solver can't find the produced mps file and the issue with Cplex is that the solver is called but can't read the produced file. I have an academic license for Gurobi and CPLEX, so that might be a problem, but the other solvers also don't run, even though the path is listed in the file Cmpl/bin/cmpl.opt. 

I've read in the Cmpl Archive that copying the .exe/.dll/.lib files from Gurobi, CPLEX etc. in the Cmpl folder might help, but this is not working as well. I've also read about using the Coliop.bat file, which is not existing in the current 1.12.0 version. Cmpl is installed in Programme (x86), while the solvers are installed in Programme.

A second solution for my problem is to export mps files and solve them manually within Gurobi etc., but the command results in an error, because of the length of a constraint:  cmplShell.bat has the following output

"Cmpl: cmpl C:/Dokumente/(...)/Coliop/VRPTW_Vorlage.cmpl -m C:/Dokumente Studium/Bachelorarbeit/Coliop/VRPTW_Vorlage.mps
fatal error: file C:/Dokumente/(...)/Coliop/VRPTW_Vorlage.cmpl line 81: Line name 'line[100]' is too long"

I hope you can help me with these problems! I attached my file to the mail.

With kind regards,

Hendrik

In the following are the error messages:

Gurobi:  

write model instance ...

CMPL model generation - finished

Solver - running

"C:/Dokumente/Studium/Bachelorarbeit/Coliop" "0" "C:/Users/Hendrik/AppData/Local/Temp/cmpl.H14308.mps" "C:/Users/Hendrik/AppData/Local/Temp/cmpl.H14308.gsol"

Das System kann den angegebenen Pfad nicht finden.

Error (interfaces): gurobi failed - exit code 

CPLEX:

write model instance ...

CMPL model generation - finished

Solver - runningShell

Welcome to IBM(R) ILOG(R) CPLEX(R) Interactive Optimizer Community Edition 12.10.0.0

with Simplex, Mixed Integer & Barrier Optimizers

5725-A06 5725-A29 5724-Y48 5724-Y49 5724-Y54 5724-Y55 5655-Y21

Type 'help' for a list of available commands.

Type 'help' followed by a command name for more

information on commands.

CPLEX> Cannot interpret file type.

File type options:

mps MPS format problem file (...)

File type: No problem exists.

No file read.

SCIP/GLPK:

write model instance ...

CMPL model generation - finished

Solver - running

Error (interfaces): can not connect the solver: SCIP ->C:/Programme/SCIPOptSuite 7.0.1/bin/scip.exe

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