Originally posted by: jiaodaxiaozi

Hi everyone,

I tried to set WorkDir parameter in cplex c++ concert technology, but I turned out my setting did not work and no errors were reported, the syntax I wrote is:

cplex.setParam(IloCplex::StringParam::WorkDir, "C:\\A");

The path "C:\\A" is right, I would be appreciate If you can tell me why. Thanks a lot.

Does this even compile? Shouldn't it be just IloCplex::WorkDir?

How did you conclude that it did not work?

Originally posted by: jiaodaxiaozi

Hi Daniel,

I conclude it did not work by the following sentences:

IloCplex cplex(env);
cplex.setParam(IloCplex::WorkDir, "C:\\A"); 
cplex.setParam(IloCplex::MIPDisplay, 3); 
cplex.setParam(IloCplex::StringParam::IntSolFilePrefix, "./newtest"); 
cplex.extract(model); 
cplex.solve();

I expected to find solution files at "C:\\A" after setting WorkDir to "C:\\A". I have tried your recommended method and I still can't find solution files. I guess maybe because I used the wrong methods to test WorkDir parameter.

Thanks.

Parameter WorkDir does not apply to the files created via IntSolFilePrefix. Try setting the IntSolFilePrefix to "C:\\A\newtest".

Originally posted by: jiaodaxiaozi

Hi Daniel,

I want to change the default cplex WorkDir parameter because after have running cplex for about 69131 seconds, my cplex reported the error message " Exception Caught: CPLEX error 1803: Failure on temporary file write ". I assume that is because my default disk doesn't have enough storage, that's why I want to make some change to WordDir parameter.

Thanks.

I am not sure this exception can be triggered by files written via IntSolFilePrefix. Do you write other files? In particular, do you have set parameter NodeFileInd to 2 or 3?

Originally posted by: jiaodaxiaozi

Hi Daniel,

I got it, so I change WorkDir parameter successfully and this change doesn't apply to IntSolFilePrefix. The exception was caught without IntSolFilePrefix used in my program. I will try to set NodeFileInd to 2 or 3 and I will tell you whether the exception will come out again. I am very grateful for your kind help.

Thanks.