GMP::Instance::SetCallbackTime installs a callback
procedure that is called after a specified number of (elapsed) seconds.
By default this callback procedure is called every two seconds.
GMP::Instance::SetCallbackTime( GMP, ! (input) a generated mathematical program callback ! (input) an AIMMS procedure )
The procedure returns 1 on success, or 0 otherwise.
- The callback procedure should have exactly one argument; a scalar
input element parameter into the set
CallbackTimecallback procedure should have a return value of
- 0, if you want the solution process to stop, or
- 1, if you want the solution process to continue.
- To remove the callback the empty element should be used as the callback argument.
CallbackTimecallback procedure is supported by CPLEX, GUROBI, CBC, ODH-CPLEX, XA, CP OPTIMIZER, CONOPT, KNITRO, SNOPT and IPOPT.
- The number of (elapsed) seconds is determined by the general solvers
Progress Time Interval. This option also specifies the interval for updating the Progress Window during a solve. As a consequence, the information passed to this callback procedure will be the same as the information displayed in the Progress Window (except for small differences for the solving time).
- The time callback will be called less often if CPLEX uses dynamic
search as the MIP Search Strategy instead of branch-and-cut. In that
case the interval between two successive calls might sometimes be
larger than the interval as specified by the option
Progress Time Interval.