JAVA: CBC MIP solver suddenly stops/hangs or is incredibly slow

[Fabio]

Hi all,

I use the or-tools for solving a MIP problem with 12 rows and 80k columns. When I solve it with the CBC binary it takes around 30s. If I run it with the or-tools i don't get a result. not even after 20min. I don't get any error or something else. It just hangs.

 

I get following output:

 

After 0 nodes, 1 on tree, 1e+050 best solution, best possible -1.020116e+009 (0.00 seconds)
Integer solution of -8.41301e+008 found by strong branching after 68 iterations and 7 nodes (0.02 seconds)
Integer solution of -8.73059e+008 found after 153 iterations and 12 nodes (0.02 seconds)
Integer solution of -9.15647e+008 found after 178 iterations and 15 nodes (0.02 seconds)
Integer solution of -9.48226e+008 found after 417 iteration  <--- (it stop in the text, it not even finish the line!)

 

Did somebody experience the same problems? Does somebody of you know a solution for it?

 

Thank you

Fabio

PS: I am using a windows 32 bit computer and the or-tools 2322 binaries

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