gistfile1.c

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

#define NALLOC		(1 << 10)
#define ALLOCSZ		(1 << 12)

int main(void) {
	void *buffers[NALLOC];
	int i;

	char cmdline[1024];
	snprintf(cmdline, sizeof(cmdline), "ps --no-headers -o rss %d", getpid());

	for (i = 0; i < NALLOC; i++)
		buffers[i] = malloc(ALLOCSZ);

	printf("Allocated memory...\n");
	system(cmdline);

	malloc(10);

	for (i = 0; i < NALLOC; i++)
		free(buffers[i]);

	printf("Freed memory...\n");
	system(cmdline);

	return 0;
}