UB Frequency

 Name: UB_FREQUENCY  Type: integer Default Value: 4 Range: $$[1 - 2,147,483,647]$$

This option sets how often the solver should solve local optimisation problems to find upper bounds. Small values for this option can be helpful in problems where finding feasible upper bounds is challenging.

For instance,UB_FREQUENCY = 1 will instruct the solver to calculate an upper bound on every node processed in the branch and bound algorithm. Therefore, increasing the probability that a feasible solution is going to be located.

This, of course, comes with a trade-off of increased solution time, i.e. the smaller theUB_FREQUENCY, the more time is spent every iteration solving the upper bounding problem.