> I'm using glpsol to solve sizable MIP problems (~50,000 binary > variables after presolving), using the command line options "--tmlim > 90 --memlim 400 --fpump --cuts --bestp --mipgap 0.05". For problems > of a certain size, the readout indicates that the "feasibility pump" > kicks in relatively quickly, after which the problem is solved > rapidly. For problems above a certain point, however, it does not > seem to kick in. What can I do to improve matters?
In fpump there is no artifical limit to the number of variables. Thus, if it cannot find a feasible solution, it may mean that the particular instance is hard for the fpump heuristic. Could you provide the complete terminal output for successful and unsuccessful cases? Thanks. Andrew Makhorin _______________________________________________ Help-glpk mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-glpk
