title: CPLEX MIP out-of-memory: NodeFileInd is 2 but no files has been created
body: <p>I know that the CPLEX out-of-memory has been discussed a lot in the forum. However non of them could sort of my issue. </p>
  
  <p>I am using CPLEX through C++ concert technology on a Widnows 7, 32-bit, 3 GB machine and I am dealing with an MIP problem. To overcome the out-of-memory issue I have set CPLEX recommended memory control parameters as below:</p>
  
  <pre><code>cplex.setParam(IloCplex::NodeFileInd,2)
  cplex.setParam(IloCplex::MemoryEmphasis,true)
  cplex.setParam(IloCplex::WorkMem,1024)
  cplex.setParam(IloCplex::TreLim,1024)
  cplex.setParam(IloCplex::Threads,1)   
  cplex.setParam(IloCplex::VarSel,3)
  </code></pre>
  
  <p>I have got the log from CPLEX as below:</p>
  
  <pre><code>Parallel mode: none, using 1 thread.
  Root relaxation solution time =    9.97 sec.
  
          Nodes                                         Cuts/
     Node  Left     Objective  IInf  Best Integer    Best Bound    ItCnt     Gap
  
        0     0        4.8000   290                      4.8000     6031
  
  Root node processing (before b&amp;c):
    Real time             =   11.97
  Sequential b&amp;c:
    Real time             =    0.00
                            -------
  Total (root+branch&amp;cut) =   11.97 sec.
  Warning: MIP starts not constructed because of out-of-memory status.
  Error: CPLEX Error  1001: Out of memory.
  </code></pre>
  
  <p>As far as I have understood no file has been created in the working directory to write the tree on. I wonder is there any other parameter to be set to make writing the tree on a file enable.</p>
  
  <p>Any comment is highly appreciated.</p>