memorywastetest.c

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/resource.h>
#define MSIZE 10000

int main() {
    int* a[MSIZE];
    struct rusage usage;

    getrusage(RUSAGE_SELF, &usage);
    printf("Not allocated: %ld\n", usage.ru_maxrss);

    for (int i = 0; i < MSIZE; i++)
        a[i] = malloc(INT_MAX);

    getrusage(RUSAGE_SELF, &usage);
    printf("Allocated: %ld\n", usage.ru_maxrss);

    for (int i = 0; i < MSIZE; i++)
        free(a[i]);

    getrusage(RUSAGE_SELF, &usage);
    printf("Freed: %ld\n", usage.ru_maxrss);
    return 0;
}