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<body class='hmmessage'><div dir='ltr'>Thanks for the hints. It seems that compiling with -lcoinmumps makes that error even when deleting the dummy mpi.h. I have only compiled with <font style="font-size: 10pt;" size="2"><br><br>mpic++ -o prueba MyNLP.cpp prueba.cpp -I/home/max/CoinIpopt/build/include/coin -L/home/max/CoinIpopt/build/lib -lipopt -llapack -ldl -lblas -lgfortran -lm -lquadmath -lcoinhsl -lcoinmeti</font>s<br><br> and worked, but the solution time has increased (6x). I have tried to use the ipopt.opt file to use ma57 but the solver is still using ma27. Is there any chance to use mumps or other solver to get a better performance? If so, which is the most recommendable?? How to use the ipopt.opt file (is that included in the compilation)?? I will appreciate your help.<br>Thanks in advance<br>Max<br> <br> </div></body>
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