Very Computer

1. segmentation faults with large static arrays using gcc under RedHat 5.1

I'm having problems with large arrays. I am using gcc 2.7.2.3 to compile
on a machine running RedHat Linux 5.1.

I compile the program listed below like this:

gcc -o test_mem test_mem.c

I have defined dim1, dim2, dim3 to 128, then the
matrix[dim1][dim2][dim3] has 2^21 elements. In this case the source
compiles, but I get a runtime error: "Segmentation fault".

Decreasing, say, dim3 to 127, results in no compilation errors and no
runtime errors, that is, the program will run.

I have tried the same procedure on a Sun running Solaris 2.5.1 and the
same things happen.

The Sun has more than a GB of RAM, my machine 256 MB.

Is there some internal limitation set by gcc, or possibly in Unix? Is
there a way around that?

Your help is greatly appreciated.

Yours, Bob Wimmer

Here's the program:

#define dim1 128
#define dim2 128
#define dim3 128   //set dim3 to 127 to get code that doesn't result in
segmentation fault.

void main()
{
int matrix[dim1][dim2][dim3];
int i,j,k;

for (i = 0; i < dim1; i++)
  {
   for (j = 0; j < dim2; j++)
     {
       for (k = 0; k < dim3; k++)
         {
           matrix[i][j][k] = 1;
         }
     }
  }
printf("programme terminated\n");

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