> This is essentially what --proxy does when searching for a first > solution. However this doesn't work now, while in the previous version > it was finding solutions. I added the line: > #define glp_term_out(x) x > at the beginning of proxy.c and found this: > > [...] > Applying PROXY heuristic... > Proxy's time limit set to 60 seconds. > Proxy's relative improvement set to 1.00 %. > Searching for a feasible solution... > GLPK Simplex Optimizer, v4.59 > 394 rows, 321 columns, 1213 non-zeros > * 0: obj = 8.685404001e+004 inf = 0.000e+000 (0) > OPTIMAL LP SOLUTION FOUND > GLPK Integer Optimizer, v4.59 > 394 rows, 321 columns, 1213 non-zeros > 154 integer variables, all of which are binary > Integer optimization begins... > + 0: mip = not found yet >= -inf (1; 0) > Warning: numerical instability (dual simplex, phase II) > 242500: obj = 2.414880323e+009 inf = 7.186e+007 (25) > 243000: obj = 2.414880323e+009 inf = 7.186e+007 (25) > 243500: obj = 2.414880323e+009 inf = 7.186e+007 (25) > 244000: obj = 2.414880323e+009 inf = 7.186e+007 (25) > [...] > > This was with just "glpsol --proxy water.mps" and is essentially the > same failure as the one I reported earlier:
I see. Which glpsol options are you using? I'm unable to reproduce this effect with just --proxy: [...] Applying PROXY heuristic... Proxy's time limit set to 60 seconds. Proxy's relative improvement set to 1.00 %. Searching for a feasible solution... >>>>> first solution = 3.856720e+05; Time used: 1.2 secs. Memory used: 1.1 Mb Starting proximity search... >>>>> it: 1: mip = 3.807289e+05; elapsed time 1.6 sec.s >>>>> it: 2: mip = 3.741220e+05; elapsed time 1.6 sec.s >>>>> it: 3: mip = 3.688283e+05; elapsed time 2.2 sec.s >>>>> it: 4: mip = 3.621303e+05; elapsed time 2.2 sec.s >>>>> it: 5: mip = 3.470957e+05; elapsed time 3.0 sec.s >>>>> it: 6: mip = 3.407846e+05; elapsed time 52.9 sec.s Time limit exceeded. Proxy heuristic terminated. Time used: 60.0. Memory used: 6.5 Mb Solution found by heuristic: 340784.606769 + 219: mip = 3.407846068e+05 >= 8.702364067e+04 74.5% (2; 0) [...] _______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk
