ILOG CPLEX supports several different heuristics to compute the starting point for the ILOG CPLEX Barrier Optimizer. The starting-point heuristic is determined by the BarStartAlg parameter, and Table 9.8 summarizes the possible settings and their meanings.
Table 9.8 BarStartAlg Parameter Settings for Starting-Point Heuristics
Setting |
Heuristic |
|---|
1 |
dual is 0 (default) |
2 |
estimate dual |
3 |
average primal estimate, dual 0 |
4 |
average primal estimate, estimate dual |
For most problems the default works well. However, if you are using the dual preprocessing option (setting the parameter PreDual to 1) then one of the other heuristics for computing a starting point may perform better than the default.
-
In the Interactive Optimizer, use the command
set barrier startalg i, substituting a value for i.
-
When using the Component Libraries, set the parameter
IloCplex::BarStartAlg or CPX_PARAM_BARSTARTALG.
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