Gap does not reduce beyond a certain percentage in a MIP

GAMS
1

Dear all,

I am solving an MIP problem. It is considerably large. While the gap reduces initially, (from 375 to 14 %). Beyond this, it does not move forward.

Can you please let me know, what can I do? I have already tried many cplex parameters. But are not fruitful.
log_file_reference.txt (40.1 KB)
Solver is CPLEX

2

MIP is a difficult (NP hard) problem class and there is no guarantee that you will be able to solve a MIP of this size to global optimality in reasonable time. You can work on the formulation etc. No easy solution.

-Michael