Need a help about linux memory management

["Aaron, Vincent" <Vincent_Aaron@mentorg.com>]

Hello world.
We have an issue about kernel memory management.
I'm an Unix administrator, and I try to implement Linux Systems in our
platform. But we have a problem with linux Big memory support.
In fact, some of our tools can allocate 4g of memory.
My linux distribution is Linux redhat 7.3 Professionnal. And the kernel 
release is 2.4.18
My script fail at about 2931 Mb


#include <stdio.h>
main()
{
  int i;
  void *a;
  for(i=0; i < 1024*2; i++) {
          printf("%d\n", i);
    a = (void *) malloc(1024*1024);
    if(!a) printf("\nError");
  }
}


What should I do to be sure that my kernel support 4g of allocation memory
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