[Cmpl] Problems with other solvers

Thu Mar 25 04:12:19 EDT 2021

Hi Mike,

thank you very much for the quick reply and the helpful information!

Gurobi and the SCIP Solver are now working as well. Only the Cplex Solver
has the same output as before, even though the cmpl.opt file for Cplex is
just the same as yours. I think Coliop calls Cplex, but Cplex is not able
to read the produced file:

*CMPL model generation - finished*

*Solver - running*

*Welcome to IBM(R) ILOG(R) CPLEX(R) Interactive Optimizer 20.1.0.0*

* 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:*

*ann Model Annotations*

*bas INSERT format basis file*

*flt Solution pool filters*

*lp LP format problem file*

*min DIMACS min-cost network-flow format file*

*mps MPS format problem file*

*mst MIP start file*

*net CPLEX network-flow format file*

*ord Integer priority order file*

*prm Non-default parameter file*

*sav Binary matrix and basis file*

*sol Solution file*

*vmc Virtual Machine Configuration*

*File type: No problem exists.*

*No file read.*

I already reinstalled Cplex, but the output is the same.

As you suggested, I saved the problem file as a free MPS file and I was
able to run this in CPLEX. So with this procedure I can use CPLEX as well.

With kind regards,

Hendrik

Am Mi., 24. März 2021 um 12:23 Uhr schrieb <mike.steglich at th-wildau.de>:

> 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  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*
>
>
>
> *Copyright IBM Corp. 1988, 2019. All Rights Reserved.*
>
>
>
>
>
> *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*
>
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/cmpl/attachments/20210325/9e059f9b/attachment.html>