size of my program too large

[George Jiang]

Thanks for your time.

--- Steps ---
During my research I have to use a Fortran program for scientific 
computation. It deals with a large model.
first, I use "f77 aa.f -o aa.exe" to compile it;
second, I use "size aa.exe" to view the size of the exe file;
third, I use "./aa.exe" to run the program.

--- Problem ---
When the size is larger than 1.0 G, I got the message "Segmentation fault 
(core dumped)"  when I run "./aa.exe";
Then I adjusted the model size, and redo step1,2,3. This time the program 
runs well.

--- Question ---
My computer has 1.5G memory; does anyone know how to fix this problem so 
that I can run the program with a larger model (my research requires me to 
run a large model)?  such a
s modify the configuration or settings of the Linux system... ( red hat 
linux 8.0
)?
( I've thought about MPI; But it's not easy to modify the program for 
parralel
computing, so I want to find another solution)

Thanks a lot!!
  George Jiang

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