GAMS — The Solver Manuals - Available Software

190 CPLEX 11
wasted computation time exploring uninteresting portions of the tree. When set at 0 (default), the mipordind
option instructs Cplex not to use priorities for branching. When set to 1, priority orders are utilized.
Note: Priorities are assigned to discrete variables using the .prior suffix in the GAMS model. Lower .prior
values mean higher priority. The .prioropt model suffix has to be used to signal GAMS to export the
priorities to the solver.
(default = GAMS PriorOpt)
0 Do not use priorities for branching
1 Priority orders are utilized
mipordtype (integer)
This option is used to select the type of generic priority order to generate when no priority order is present.
(default = 0)
0 None
1 decreasing cost magnitude
2 increasing bound range
3 increasing cost per coefficient count
mipsearch (integer)
Sets the search strategy for a mixed integer program. By default, Cplex chooses whether to apply dynamic
search or conventional branch and cut based on characteristics of the model.
(default = 0)
0 Automatic
1 Apply traditional branch and cut strategy
2 Apply dynamic search
mipstart (integer)
This option controls the use of advanced starting values for mixed integer programs. A setting of 1 indicates
that the values should be checked to see if they provide an integer feasible solution before starting
optimization.
(default = 0)
0 do not use the values
1 use the values
miqcpstrat (integer)
This option controls how MIQCPs are solved. For some models, the setting 2 may be more effective than
1. You may need to experiment with this parameter to determine the best setting for your model.
(default = 0)
0 Automatic
1 QCP relaxation. Cplex will solve a QCP relaxation of the model at each node.
2 LP relaxation. Cplex will solve a LP relaxation of the model at each node.
mircuts (integer)
Determines whether or not to generate mixed integer rounding (MIR) cuts during optimization. At the
default of 0, generation is continued only if it seems to be helping.
(default = 0)
-1 Do not generate MIR cuts
0 Determined automatically