Thank you very much. The problem size is about 4e11. I guess it is the first case. However, up to now I am using glpk to output cplex problem file rather than solving it. I thought it might work just to formulate a large problem. Is the up-bound of glpk function 4Gb? If so, I might think about other ways.
Thanks, Joy Andrew Makhorin wrote: >> Could you help how to compile my program by gcc in 64bit mode? Because >> my current problem is the parameter "ne" for lpx_load_matrix exceeds the >> size of 32 bit "int". I have to use "long int" to represent "ne". Then, >> lpx_load_matrix will have a warning of none comparative parameter. >> > > Do you mean that your problem has more than two billions coefficients? > Or you just need to use long int's due to some other reasons? If the > former, it is doubtful that glpk is able to solve such huge problem. > > Using 64-bit mode is only reasonable to address more space than 4Gb > on solving large instances. To compile glpk in 64-bit mode you should > specify appropriate hardware model options; for details see: > http://gcc.gnu.org/onlinedocs/gcc/Submodel-Options.html > > > -- Best Regards, Zhang, Xiaolan (Joy) 210 Coordinated Science Lab University of Illinois, Urbana-champaign www.uiuc.edu/~xzhang29 _______________________________________________ Help-glpk mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-glpk
