Heuristics
CPLEX supports a heuristic to find integer solutions at nodes during the branch & cut procedure. To invoke this heuristic:
For example, if the frequency is set to 20, then the node heuristic will be applied at node 0, node 20, node 40, and so on. At the default setting 0 (zero), ILOG CPLEX automatically determines the frequency dynamically. The value -1 turns this feature off.
