#include <malloc.h>
#include <stdio.h>
#include <unistd.h>

#define SIZE (20*1024l*1024*1024)

int main(int argc, char ** argv) {
        char *m = malloc(SIZE);
        long i;
        for (i=0; i<SIZE; i++) {
                m[i]=1;
        }
        printf("Allocated and used %ld bytes, sleeping a bit\n", SIZE);
        sleep(5);
}