MIPFRACREDUCE

Branch and Bound: Specifies how often the optimizer should run a heuristic to reduce the number of fractional integer variables in the node LP solutions.

Integer

-1	Automatic.
0	Disabled.
1	Run before and after cutting on the root node.
2	Run also during root cutting.
3	Run also during the tree search.

-1

This heuristic is only applicable to problems that are dual degenerate. These are problems that contain multiple solutions with identical objective function value. The more dual degenerate a problem is, the more likely it will be for this heuristic to have an improving effect.

XPRSmipoptimize ( MIPOPTIMIZE).