How to use CPLEX?

[gguillot]

Hi,
I want to use CPLEX instead of SYMPHONY, I changed the config file, but I can't link the solver.
Do you know what needs to be changed to link the solver?

Thank you.

[tkralphs]

Assuming you are building from source with coinbrew, you have to tell MibS where to find CPLEX. For example, I build as follows on our cluster.

coinbrew build MibS --with-cplex-incdir=/usr/local/cplex/include/ilcplex --with-cplex-lib="-L/usr/local/cplex/lib/x86-64_linux/static_pic/ -lcplex -lpthread -lm"

Then, set the solver to CPLEX with the option -MibS_feasCheckSolver CPLEX. Let me know how it goes.

[hlefebvr]

Hi, fyi, I also had to use -ldl :-)

[tkralphs]

I'm going to move this to a Discussion instead of an Issue, since it's more of question than a problem.

[gguillot]

Hi,
i tried your solution, the build is correct but when I want to solve an instance, i have this error:

ERROR:CPLEX chosen as solver, but it has not been enabled

Thanks for your help.

[ansarimoiz]

Hello @gguillot , I am also trying to use this solver for a mixed integer bilevel program.
Can we connect?

Thank You

[tkralphs]

i tried your solution, the build is correct but when I want to solve an instance, i have this error:
ERROR:CPLEX chosen as solver, but it has not been enabled
Thanks for your help.

This means that for some reason, CPLEX was not actually properly linked. Can you provide some more details, such as the version of MibS you are building, the platform, the exact sequence of commands, etc.? If you know how to, either attach the file config.log from <build-dir>/MibS/* or else re-run the build with --verbosity 4 and attach the full output here.

[hlefebvr]

Hi,

I am trying to build MibS@1.2 with CPLEX 22.1.1 with the following command:

./coinbrew build MibS --with-cplex-incdir=/software/ilog/22.1.1/cplex/include/ilcplex --with-cplex-lib="-L/software/ilog/22.1.1/cplex/lib/x86-64_linux/static_pic/ -lcplex -lpthread -lm -ldl" --disable-cplex-libcheck

However, I get Osi unit test failures...

##################################################
### Configuring Osi 0.108 
##################################################


##################################################
### Building Osi 0.108 
##################################################


##################################################
### Running Osi unit test 
##################################################

Testing OsiRowCut with OsiCpxSolverInterface
Testing OsiColCut with OsiCpxSolverInterface
Testing OsiRowCutDebugger with OsiCpxSolverInterface
Testing OsiCuts
Testing OsiCpxSolverInterface
cplex: running common unit tests.
Testing row/column name handling ...*** cplexSolverInterface testing issue: testObjFunctions: primal objective limit failed: si->isPrimalObjectiveLimitReached()
*** cplexSolverInterface testing issue: testObjFunctions: dual objective limit failed: si->isDualObjectiveLimitReached()
*** cplexSolverInterface testing issue: testObjFunctions: primal objective limit failed: si->isPrimalObjectiveLimitReached()
*** cplexSolverInterface testing issue: testObjFunctions: dual objective limit failed: si->isDualObjectiveLimitReached()
*** cplexSolverInterface testing issue: cloning of application data failed: *(static_cast< int * >(si2->getApplicationData())) == ad
Checking that solver can set row and column solutions ...*** cplexSolverInterface testing issue: setting solutions: reduced costs from solution set with setRowPrice failed: ok == true
*** cplexSolverInterface testing issue: setting solutions: row activity from solution set with setColSolution failed: ok == true
*** cplexSolverInterface testing issue: Errors handling imposed column/row solutions.
Testing loadProblem and assignProblem methods.
Testing writeMps and writeMpsNative.
Testing writeLp and writeLpNative.
*** cplexSolverInterface testing issue: testReducedGradient failed: si->getReducedGradient(cbar, y, c) threw CoinError: Needs coding for this interface in OsiSolverInterface in getReducedGradient
*** cplexSolverInterface testing issue: testReducedGradient failed: si->getReducedGradient(cbar, y, c) threw CoinError: Needs coding for this interface in OsiSolverInterface in getReducedGradient
Checked 8 hints x (true, false) at strength OsiForceDo; 16 throws.
*** cplexSolverInterface testing issue: testOsiPresolve: postsolve number of iterations failed: si->getIterationCount() == 0
Testing status for artificial variables.
***Skipped Testing of OsiSolverInterface on Netlib problems***
***use -testOsiSolverInterface to run them.***
Tests completed with 1 unexpected errors.
make[1]: *** [Makefile:693: test] Error 1
make: *** [Makefile:915: test] Error 2

Error: Build failed, see error output above

I a doing this on a machine running Linux Rocky Linux 8.9 (Green Obsidian).

What can I do to fix this ?

Thank you,

Henri.

[tkralphs]

Just invoke coinbrew with --tests=none and it should go through.