The cold start option controls the linear solver that is used by the branch-and-bound solver at each node of the solution tree when a previous solution is not present to use as a "warm start". The warm start option determines the solver to use when a previous solution does exist.

There are four possible settings for REOPTX:

REOPTX

Value

 

Cold Start Solver

0

LINGO Decides – LINGO chooses the most appropriate solver.

1

Primal  – The primal solver will be used exclusively.

2

Dual – The dual solver will be used exclusively.

3

Barrier – LINGO uses the barrier method, assuming you have purchased a license for the barrier solver. Otherwise, the dual solver will be used.

In general, LINGO Decides will yield the best results. However, experimentation with the other options may be fruitful.