Originally posted by: CDYD_Victor_Miller

I have an .lp file for an integer program. I ran it once using the cplex command, and it produced a solution in 221 seconds (which I saved). The cplex.log says

Parallel mode: deterministic, using up to 8 threads.

Yet, when I run it with the same options, I can't reproduce the results. Right now it's been running for 580 seconds and hasn't found the solution yet. Any suggestions as to what I can do to reproduce the original solution?

Victor
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Originally posted by: SystemAdmin

Is that the exact same machine, the exact same CPLEX version, the exact same input file, and the exact same parameter settings?
If all of them are exactly the same then this looks like a bug.
What parameter settings do you use? Do you use any kind of time limit?
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Originally posted by: CDYD_Victor_Miller

Yes, it's the exact machine, exact input file, and exact parameters (as far as I can see -- does the cplex.log file list all the parameters it's used?). I don't impose a time limit (the first time I ran it, it took 221 seconds. The next time I ran it it took 586 seconds).
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Originally posted by: SystemAdmin

Hm, the log file does not show any parameter settings unless you explicitly say 'display settings changed'. If you do so it should display all the parameters that are at non-default values.
Could you store your model as a SAV file and attach it here?
By the way: is it only the solution time that is different or is it also the node and/or iteration counts that are different? Can you post the log files of the two different runs?
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