GAMS — The Solver Manuals - Available Software

196 CPLEX 11
1 Force node presolve
2 Perform probing on integer-infeasible variables
pricelim (integer)
Size for the pricing candidate list. Cplex dynamically determines a good value based on problem dimensions.
Only very rarely will setting this option manually improve performance. Any non-negative integer values
are valid.
(default = 0, in which case it is determined automatically)
printoptions (integer)
Write the values of all options to the GAMS listing file. Valid values are no or yes.
(default = 0)
probe (integer)
Determines the amount of probing performed on a MIP. Probing can be both very powerful and very time
consuming. Setting the value to 1 can result in dramatic reductions or dramatic increases in solution time
depending on the particular model.
(default = 0)
-1 No probing
0 Automatic
1 Limited probing
2 More probing
3 Full probing
probetime (real)
Limits the amount of time in seconds spent probing.
(default = 1e+075)
qpmakepsdind (integer)
Determines whether Cplex will attempt to adjust a MIQP formulation, in which all the variables appearing
in the quadratic term are binary. When this feature is active, adjustments will be made to the elements
of a quadratic matrix that is not nominally positive semi-definite (PSD, as required by Cplex for all QP
formulations), to make it PSD, and will also attempt to tighten an already PSD matrix for better numerical
behavior. The default setting of 1 means yes but you can turn it off if necessary; most models should
benefit from the default setting.
(default = 1)
0 Off
1 On
qpmethod (integer)
Specifies which QP algorithm to use.
At the default of 0 (automatic), barrier is used for QP problems and dual simplex for the root relaxation of
MIQP problems.
(default = 0)
0 Automatic
1 Primal Simplex
2 Dual Simplex
3 Network Simplex
4 Barrier