mem.c

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

#define BLOCKSIZE 1048576
#define N 200
#define BUSYTIME 1000

int main(int argc, char *argv[]) {
    int **p = malloc(N * sizeof(int*));;
    int i;
    while (1) {
        for (i = 0; i < N; i++) {
            p[i] = malloc(BLOCKSIZE);
            memset(p[i],'\0',BLOCKSIZE);
            usleep(BUSYTIME);
        }

        fprintf(stderr, "malloced\n");

        for (i = 0; i < N; i++) {
                free(p[i]);
                usleep(BUSYTIME);
        }
        fprintf(stderr, "freed\n");
    }
}

run.sh

#!/usr/bin/env bash

i=0
while ((i<22)); do
    nohup ./mem &
    let ++i
    echo $i
    sleep 1
done