sci.op-research

On Mar 5, 2:20 am, caokeg...@126.com wrote:
> On 3=D4=C25=C8=D5, =CF=C2=CE=E75=CA=B115=B7=D6, caokeg...@126.com wrote:
>
>
>
> > today, I used cplex to solve a large scale MIP problem, and I met with
> > a difficult problem, "Error 1001: out of memory"! I searched in google
> > and cplex user mannual, I got when dealing with large scale problems,
> > it may lack enough physical memory. according to suggested methods, I
> > set several parameters as follows:
>
> > cplex.setParam(IloCplex::TiLim,86400000);
> > cplex.setParam(IloCplex::WorkDir,".");
> > cplex.setParam(IloCplex::WorkMem,512000);
> > cplex.setParam(IloCplex::MIPDisplay,0
> > cplex.setParam(IloCplex::NodeFileInd,3);
>
> > however, the problem still exists, and I have tried all the ways I can
> > think out.
>
> > the physical memory is 1GB, the OS is windows XP.
>
> > I'd appreciate anybody give me a useful suggestion. thank you!
>
> I call cplex in vc2005, and parameters listed above have been changed
> with different values, but it still doesn't work...

1 GB is apparently not sufficient. One can solve with close to 4GB on
Linux 32-bit systems, maybe 2 or 3 GB with XP. For more you will need
a 64-bit system.
HOWEVER, since you are solving a MIP the tree could get too big. If
that really is the case you would write it do disk.