MIP node log interval
Controls the frequency of node logging when the MIP display parameter is set higher than 1 (one).
Purpose
MIP node log interval
| API | Parameter Name | Name prior to V12.6.0 |
|---|---|---|
| C | CPXPARAM_MIP_Interval | CPX_PARAM_MIPINTERVAL |
| C++ | IloCplex::Param::MIP::Interval | MIPInterval (long) |
| OPL | mipinterval | |
| Interactive | mip interval | mip interval |
| Identifier | 2013 | 2013 |
Description
Controls the frequency of node logging when the MIP display parameter (MIP node log display information) is set higher than 1 (one). Frequency must be an integer; it may be 0 (zero), positive, or negative.
By default, CPLEX displays new information in the node log during a MIP solve at relatively high frequency during the early stages of solving a MIP model, and adds lines to the log at progressively longer intervals as solving continues. In other words, CPLEX logs information frequently in the beginning and progressively less often as it works.
When the value is a positive integer n, CPLEX displays new incumbents, plus it displays a new line in the log every n nodes.
When the value is a negative integer n, CPLEX displays new incumbents, and the negative value determines how much processing CPLEX does before it displays a new line in the node log. A negative value close to zero means that CPLEX displays new lines in the log frequently. A negative value far from zero means that CPLEX displays new lines in the log less frequently. In other words, a negative value of this parameter contracts or dilates the interval at which CPLEX displays information in the node log.
| Value | Meaning |
|---|---|
| n < 0 | Display new incumbents, and display a log line frequently at the beginning of solving and less frequently as solving progresses |
| 0 (zero) | automatic: let CPLEX decide the frequency to log nodes (default) |
| n > 0 | Display new incumbents, and display a log line every n nodes |
See also