The run with cbc executable that does not fail was using a May 2009 version of code. <br><br>Using
the current trunk it fails (same as when using CbcMain1):<br><br><div class="gmail_quote"><p>[magala@orclus71 src]$ ./cbc ~/subProb.n0.c0.p1.b0.lp</p>
<p>Coin Cbc and Clp Solver version 1.2trunk, build Sep 10 2009</p>
<p>command line - ./cbc /users/magala/subProb.n0.c0.p1.b0.lp
(default strategy 1)</p>
<p>Continuous objective value is 46.6667 - 0.00 seconds</p>
<p>Cgl0003I 20 fixed, 0 tightened bounds, 0 strengthened rows,
0 substitutions</p>
<p>Cgl0003I 5 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions</p>
<p>Cgl0003I 0 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions</p>
<p>Cgl0004I processed model has 0 rows, 0 columns (0 integer)
and 0 elements</p>
<p>Segmentation fault</p><br><br><br><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-US">
<div>
<p>The following small IP fails using the CbcMain1 interface. It
is a unique case, because all rows and cols are removed by presolver.</p>
<p> </p>
<p><a href="http://coral.ie.lehigh.edu/%7Emagh/tmp/subProb.n0.c0.p1.b0.lp" target="_blank">http://coral.ie.lehigh.edu/~magh/tmp/subProb.n0.c0.p1.b0.lp</a></p>
<p> </p>
<p><a href="https://projects.coin-or.org/Cbc/ticket/79" target="_blank">https://projects.coin-or.org/Cbc/ticket/79</a></p>
<p> </p>
<p> CbcModel
cbc(*subprobSI);</p>
<p> CbcMain0(cbc);</p>
<p> const
char * argv[] = {"cbc","-solve","-quit"};</p>
<p> CbcMain1(3,
argv, cbc);</p>
<p> </p>
<p>Coin Cbc and Clp Solver version 1.2trunk, build Sep 9
2009</p>
<p>command line - cbc -solve -quit (default strategy 1)</p>
<p>Continuous objective value is 46.6667 - 0.00 seconds</p>
<p>Cgl0003I 20 fixed, 0 tightened bounds, 0 strengthened rows,
0 substitutions</p>
<p>Cgl0003I 5 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions</p>
<p>Cgl0003I 0 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions</p>
<p>Cgl0004I processed model has 0 rows, 0 columns (0 integer)
and 0 elements</p>
<p> </p>
<p>gdb gives:</p>
<p> </p>
<p>Program received signal SIGSEGV, Segmentation fault.</p>
<p>0x0000003ffa871f6b in free () from /lib64/libc.so.6</p>
<p>(gdb) where</p>
<p>#0 0x0000003ffa871f6b in free () from /lib64/libc.so.6</p>
<p>#1 0x000000000057bc41 in ~CbcRounding
(this=0x7fffec90c080)</p>
<p> at ../../../Cbc/src/CbcHeuristic.cpp:1552</p>
<p>#2 0x00000000004ae837 in doHeuristics
(model=0x1d1f3e00, type=1)</p>
<p> at ../../../Cbc/src/CbcSolver.cpp:3479</p>
<p>#3 0x00000000004c7776 in CbcMain1 (argc=3,
argv=0x7fffec9150c0,</p>
<p> model=@0x7fffec914bb0, callBack=0x4a734c
<dummyCallBack>)</p>
<p> at ../../../Cbc/src/CbcSolver.cpp:6680</p>
<p>#4 0x00000000004db968 in CbcMain1 (argc=3,
argv=0x7fffec9150c0,</p>
<p> model=@0x7fffec914bb0) at
../../../Cbc/src/CbcSolver.cpp:3099</p>
<p> </p>
<p> </p>
<p> </p>
<p>Note, if I run it from the command line using cbc executable,
the error does not occur.</p>
<p> </p>
<p>[magala@orclus71 MMKP]$ ~/COIN/coin-Cbc/build-g/bin/cbc
subProb.n0.c0.p1.b0.lp</p>
<p>Coin Cbc and Clp Solver version 1.2trunk, build May 27 2009</p>
<p>command line - /users/magala/COIN/coin-Cbc/build-g/bin/cbc
subProb.n0.c0.p1.b0.lp (default strategy 1)</p>
<p>Continuous objective value is 46.6667 - 0.00 seconds</p>
<p>Cgl0003I 20 fixed, 0 tightened bounds, 0 strengthened rows,
0 substitutions</p>
<p>Cgl0003I 5 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions</p>
<p>Cgl0003I 0 fixed, 0 tightened bounds, 0 strengthened rows, 8
substitutions</p>
<p>Cgl0004I processed model has 0 rows, 0 columns (0 integer)
and 0 elements</p>
<p>Cbc3007W No integer variables - nothing to do</p>
<p>Cuts at root node changed objective from 46.6667 to -1.79769e+308</p>
<p>Probing was tried 0 times and created 0 cuts of which 0 were
active after adding rounds of cuts (0.000 seconds)</p>
<p>Gomory was tried 0 times and created 0 cuts of which 0 were
active after adding rounds of cuts (0.000 seconds)</p>
<p>Knapsack was tried 0 times and created 0 cuts of which 0
were active after adding rounds of cuts (0.000 seconds)</p>
<p>Clique was tried 0 times and created 0 cuts of which 0 were
active after adding rounds of cuts (0.000 seconds)</p>
<p>MixedIntegerRounding2 was tried 0 times and created 0 cuts
of which 0 were active after adding rounds of cuts (0.000 seconds)</p>
<p>FlowCover was tried 0 times and created 0 cuts of which 0
were active after adding rounds of cuts (0.000 seconds)</p>
<p>TwoMirCuts was tried 0 times and created 0 cuts of which 0
were active after adding rounds of cuts (0.000 seconds)</p>
<p>Result - Finished objective 46.66667 after 0 nodes and 0
iterations - took 0.00 seconds (total time 0.01)</p>
<p>Total time 0.01</p>
</div>
</div>
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<br></blockquote></div><br>