I’ll share an experience.
I have a mixed linear optimization problem.
When I use a feasibre solution (MIPstart), sometimes CPLEX performs worse than if I let it determine an incumbent solution automatically.
Sometimes when I don’t use MIPstart, CPLEX doesn’t even determine an integer solution.
for i in I for t in T set_start_value(s[i,t],1) end end
What is your experience in this matter? Fix variables and ensure an incumbet solution or leave CPLEX determine automatically?