Hi Andrew, I think FPUMP Heuristic pass routine has a bug in GLPK4.60
When Fpump finds a solution, it loop back again to the beginning of pass instead of continuing from the current npass. See the log below. Noli ~~~~~~~~~ . . * 10500: obj = 1.610401485e+05 inf = 8.027e-12 (5255) 3 * 11000: obj = 1.611132718e+05 inf = 7.347e-12 (413) 3 * 11279: obj = 1.611244848e+05 inf = 1.124e-10 (0) 2 OPTIMAL LP SOLUTION FOUND Integer optimization begins... WARNING: LONG-STEP DUAL SIMPLEX WILL BE USED + 11279: mip = not found yet <= +inf (1; 0) Applying FPUMP heuristic... Pass 1 Pass 2 Solution found by heuristic: 147859.9 Pass 1 Pass 2 Pass 3 Pass 4 Pass 5 + 11279: mip = 1.478599000e+05 <= 1.611235344e+05 9.0% (2; 0) Time used: 86.3 secs. Memory used: 107.8 Mb. + 11279: mip = 1.478599000e+05 <= 1.611235344e+05 9.0% (2; 0) RELATIVE MIP GAP TOLERANCE REACHED; SEARCH TERMINATED _______________________________________________ Bug-glpk mailing list Bug-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/bug-glpk
