I am trying to solve a fairly large MILP model, however, the solver is taking ages to reduce the GAP. I am aiming to get a GAP ideally under 1% and do so in under 6hrs as I need to run the same model with different values around at least 50 times.
I have already tried many different options such as MIPFocus=1, 2, 3 which lead to 0 solutions. Heuristic=0, 0.5 with the same result, 0 solutions. Method=3 which gave me a solution with 1.80% in 6hrs. ConcurrentMIP=2, 4, 6 using a combination of Threads=4, 6, 12, 18, 24 with the same result of ~1.80% in 6hrs.
Can you please advice on what can I do to reduce the solving times and achieve a GAP under 1%?
here is the full log of one of the test I ran with MIPGap =0.01 and Threads =18:
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