#20 closed defect (fixed)
bugs in cbc (command interface)
Reported by: | matteo.fischetti | Owned by: | somebody |
---|---|---|---|
Priority: | major | Component: | component1 |
Version: | 1.0 | Keywords: | memory leak in cbc |
Cc: |
Description
I posted at
www.dei.unipd.it/~fisch/bugs.zip
3 cases where cbc gets stuck before entering the FP heuristic and the branching phase: just run the 3 batch files in the zip file.
Instances bug1 and bug3 are similar and get stuck here:
... Initial range of elements is 1 to 100 Final range of elements is 0.302821 to 3.30228 Absolute values of scaled rhs range from 0.7897 to 1448, minimum gap 1e+100 Absolute values of scaled objective range from 4794.78 to 3.30228e+009 Absolute values of scaled bounds range from 0.277688 to 156.122, minimum gap 0.277688 <-- no more output
whereas instance bug2 has problems in the strengthening phase and ends with a crash (memory leak?)
Optimal - objective value 2.30089e+010 Coin0506I Presolve 940 (-914) rows, 7887 (-1419) columns and 97967 (-18829) element s Cgl0003I 459 fixed, 2871 tightened bounds, 2 strengthened rows, 0 substitutions Cgl0003I 459 fixed, 0 tightened bounds, 2 strengthened rows, 0 substitutions Cgl0003I 82 fixed, 1852 tightened bounds, 6 strengthened rows, 0 substitutions Cgl0003I 0 fixed, 0 tightened bounds, 6 strengthened rows, 0 substitutions Cgl0003I 9 fixed, 447 tightened bounds, 6 strengthened rows, 0 substitutions Cgl0003I 0 fixed, 0 tightened bounds, 6 strengthened rows, 0 substitutions Cgl0003I 32 fixed, 58 tightened bounds, 6 strengthened rows, 0 substitutions Cgl0003I 11 fixed, 44 tightened bounds, 6 strengthened rows, 0 substitutions Cgl0003I 0 fixed, 0 tightened bounds, 6 strengthened rows, 0 substitutions Cgl0003I 1 fixed, 0 tightened bounds, 6 strengthened rows, 0 substitutions Cgl0003I 0 fixed, 0 tightened bounds, 6 strengthened rows, 0 substitutions Cgl0003I 345 fixed, 3484 tightened bounds, 7 strengthened rows, 0 substitutions Cgl0003I 0 fixed, 0 tightened bounds, 7 strengthened rows, 0 substitutions Cgl0003I 0 fixed, 0 tightened bounds, 7 strengthened rows, 0 substitutions Cgl0003I 0 fixed, 0 tightened bounds, 7 strengthened rows, 0 substitutions Cgl0003I 0 fixed, 0 tightened bounds, 7 strengthened rows, 0 substitutions <-- crash
Thanks
--Matteo Fischetti--
p.s. can I skip the (often time consuming)tightened phase
Cgl0003I 459 fixed, 2871 tightened bounds, 2 strengthened rows, 0 substitutions
by just specifing a parameter in the command-line cbc.exe?
p.s.2 is someone aware of a version of the command-interface that can be invoked as a function by a calling program, by passing the argument string "-import ..."? This could be useful as a quick shot to use cbc in its "command interface" implementation, which peforms quite well indeed. Allowing .lp input files would also help. I started working on it but I still have some memory leaks.
Change History (2)
comment:1 Changed 12 years ago by forrest
- Resolution set to fixed
- Status changed from new to closed
OK now - may get round to looking at memory leak aspect