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PoolSearchMode
Selects different modes for exploring the MIP search tree
| Type: | int | |
|---|---|---|
| Default value: | 0 | |
| Minimum value: | 0 | |
| Maximum value: | 2 |
Selects different modes for exploring the MIP search tree. With the
default setting (PoolSearchMode=0), the MIP solver tries to find an
optimal solution to the model. It keeps other solutions found along
the way, but those are incidental. By setting this parameter to a
non-default value, the MIP search will continue after the optimal
solution has been found in order to find additional, high-quality
solutions. With a non-default value (PoolSearchMode=1 or
PoolSearchMode=2), the MIP solver will try to find n
solutions, where n is determined by the value of the
PoolSolutions parameter.
With a setting of 1, there are no guarantees about the quality of
the extra solutions, while with a setting of 2, the solver will
find the n best solutions. The
cost of the solve will increase with increasing values of this
parameter.
Once optimization is complete, the
PoolObjBound attribute can be used to
evaluate the quality of the solutions that were found. For example, a
value of PoolObjBound=100 indicates that there are no other
solutions with objective better 100, and thus that any known solutions
with objective better than 100 are better than any as-yet undiscovered
solutions.
Note: Only affects mixed integer programming (MIP) models
For examples of how to query or modify parameter values from our different APIs, refer to our Parameter Examples.
