MIP model does not return any solution and any error message-CPLEX

GAMS
1

Hello GAMS community,

I have a large MIP model that I run using CPLEX on a supercomputer with 768GB memory. The model stops running after a couple of hours without returning any solution. Model status and solver status are both 13. All the CPLEX options including OptCR are at the default values. My guess is that the model hits some limit but I cannot figure out what kind of limit exactly. I have chosen reslim equal to 10000000. Can someone please take a look at the attached file and let me know if they see anything suspicious in the file?

Thanks in advance, Sirin
Trace.txt (103 KB)

2

I suggest that you run recent versions of the software. Cplex still solves the root LP and stops after a little more than an hour. If your “super computer” uses some kind of batch submission system I guess the system has imposed some resource limits (time and/or memory) and kills the job afterwards. Unfortunately, the log did not contain any model size information, but I would try to use the Barrier algorithm as for the root LP (startalg=4).

-Michael