Originally posted by: EricCPLEX

Hi,

With CPLEX 10, I used an Incumbent Callback to save each
integer feasible solution found by cplex during a MIP
optimization (I use C++ concert technology).

Now, with CPLEX12.1, I would like to do the same, but with
dynamic search and parallel optimization. Since Control
callbacks (such as IncumbentCallbacks) are incompatible
with dynamic/parallel search, I tried to replace them by a
MIPInfoCallBack to check (with hasIncumbent() method) if the
current node gives an integer feasible solution. When the
algorithm calls the callback MIPInfoCallBack, everything
works fine and I have the opportunity to save my solution.

The problem is the algorithm doesn't call the MIPInfoCallback
at each node and I lose several integer feasible solutions.

On page 838 of the user's manual, it is announced that "The
algorithms call an informational callback when the algorithm
finds it appropriate; for some algorithms , an informational
callback is called at every node; for other algorithms, an
informational callback is called at convenient points in the
progress of the algorithm." Is it possible to tell cplex
to call my MIPInfoCallback at every node ?

Thanks for you help !
Eric
#DecisionOptimization
#OPLusingCPLEXOptimizer