Originally posted by: geffer

In my view, CPLEX could solve a variety of problems and would like to do that in a simple and robust way. I have two questions in Total time for cplex solving.

1.what's the relation between the actual compute time in c++ and the total compute time displayed in cmd?
2.In order to decrease the compute time, how did I choose the method between big-m and if-then, what's their corresponding circumstances？ They are in a great distance when solving particular problem.

thx
ALLEN
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Originally posted by: zhixin

you can use function clock() to track the CPU time of the program.
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Originally posted by: geffer

thanks for your reply, what's the difference between this two time?
Furthermore, if I want to have a computational results, which data is preferred? Cpu time or data cplex dispayed?
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Originally posted by: SystemAdmin

In computational results you would usually report the numbers that CPLEX displays (you can change CPLEX time to CPU time by changing the ClockType parameter).
In general, there are two steps when solving a problem with CPLEX:
1. Setup the model.
2. Solve the model.
CPLEX only displays time spent in the second step. If you spend significant time in the first step then you may have to include that in the results you report.
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Originally posted by: geffer

THANKS FOR ALL REPLY
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