怎么回内存不足呢？怎么办？

guzhou

我的机子有2G内存，计算100万网格就说内存不足，但提示的内存并没有超过2G呀。有什么办法？
+--------------------------------------------------------------------+
| Memory Allocated for Run (Actual usage may be less) |
+--------------------------------------------------------------------+
  Data Type Kwords Words/Node Words/Elem Kbytes Bytes/Node
  Real 256423.2 238.31 251.83 1001653.2 953.25
  Integer 71658.5 66.60 70.37 279915.9 266.39
  Character 2346.8 2.18 2.30 2291.8 2.18
  Logical 40.0 0.04 0.04 156.2 0.15
  Double 1208.0 1.12 1.19 9437.5 8.98
+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| *** Run-time memory allocation error *** |
| Not enough free memory is currently available on the system. |
| Could not allocate requested memory - exiting! |
| |
| |
| |
+--------------------------------------------------------------------+
   
+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The CFX-5 solver exited with return code 2. No results file has |
| been created. |
+--------------------------------------------------------------------+
End of solution stage.
This run of the CFX-5 Solver has finished.