Closed as fixed if next.
Setting the solution pool intensity parameter to 4 instructs CPLEX to enumerate all feasible solutions. However, if a model is simple enough that CPLEX can trivially derive a bound on the optimal objective value and a feasible solution with that value, optimality has been proved, and the solution pool algorithm doesn't generate the tree needed to enumerate all feasible solutions. For more information/discussion, see http://orinanobworld.blogspot.com/2013/01/solution-pool-all-is-n ot-all.html RTC-15222 This only strikes on very simple models that solve to optimality before the main presolve loop starts.
Set the heuristic frequency parameter to -1 Also, do not set the solution pool absgap or mipgap parameters to finite values.
Solution pool may not properly enumerate all feasible solutions on trivial models
Disable heuristics. Also, don't set solution pool absgap or mipgap parameters.
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CPLEX OPTI STUD
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