I am using the Cplex IDE 12.5 to code a MIP problem. For the 16 jobs' problem, the software need 10 seconds to preprocess the problem, and then I can see the engine log. When I increase the job size to 32, the software need around 80 seconds to preprocess the problem.
I am running a 400 jobs problem now. It is 69 hours now and haven't finished the preprocess.
Is there any way to speed up the preprocess? Also can I observe the log and see what happened during the preprocess?