Dear Friends,

I run my MINLP model by different solvers as follows. I also run it by BARON, but after 9 hours I stopped it as it was still working. Moreover, except LINDOGLOBAL which lasted for around 6 hours, the others took less than 1 minute.

My question is that why the result of LINDOGLOBAL which is a global optimizer and has found the optimal solution is 7.01413955539465E-06 less than BONMIN which has found the integer solution (the problem is maximization).

Which solver I must choose?

z2 T1 T2 v g Solver Status

LINDOGLOBAL 855434.1617686 0.054794521 0.01 15.14004249 4 optimal

BONMIN 855434.1617756 0.05479452 0.01 15.14004623 4 integer solution

OQNLP 855434.1617686 0.054794521 0.01 15.14004623 4 integer solution

SBB 855434.1617686 0.054794521 0.01 15.14004623 4 integer solution

KNITRO 855434.1617677 0.054794521 0.01 15.14004631 4 integer solution

DICOPT 855434.1617686 0.054794521 0.01 15.14004623 4 integer solution

Best regards.

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