I'm using the Java API of CPLEX 12.6.1 (with license) to solve a MILP (Mixed-Integer Linear Programming) maximization problem.
The point is that, after 21 hours, CPLEX has consumed 32 GB of RAM and the whole (30 GB) Swapping Memory.
While CPLEX runs I'm able to see its "log" output, and I saw that:
- the "Gap" coloumn is always blank;
- the "Best Integer" coloumn is always blank;
so, no solution has been found.
Moreover (after the first few seconds where it changes a bit), the value in "Best Bound" coloumn is always the same (equal to 52.2911) during the 21 hours.
How could I solve this problem?
I already increased the absolute and the relative MIP GAP (I set both of them to 0.1), but without solving.
Are there any parameters which can I tune to help CPLEX to find a solution?