Allocates a given amount of MB of memory

memory_test.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main (int argc, char *argv[]) {
   int memsize;
   char **mem;
   int i;

   if (argc != 2 || sscanf(argv[1],"%d",&memsize)!=1) {
       fprintf(stderr, "%s: memsize (MB)\n", argv[0]);
       return 1;
   }

   mem = malloc(memsize*sizeof(char*));
   for (i=0; i<memsize; i++) {
       mem[i] = malloc(1024*1024);
       if (mem[i]!=NULL)
          memset(mem[i],0,1024*1024);
   }

   fprintf(stderr,"Press any key to terminate.\n");
   fgetc(stdin);

   for (i=0; i<memsize; i++)
       free(mem[i]);
   free(mem);

   return 0;
}