fillmem.c

/* fillmem.c
 * pack system memory with random numbers, then sleep
 * for memory manager development and testing
 */

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

int main(int argc, char *argv[])
{
    int *data;
    int megs_to_fill = 512;
    long allocs;
    int sleeptime = 300;
    int c, tmp, i;
    int randomized;

    while ((c = getopt(argc, argv, "m:s:")) != -1){
        switch(c){
        case 'm':
            tmp = atoi(optarg);
        if (0 < tmp && tmp < 1025){
            megs_to_fill = tmp;
        }
        break;
        case 's':
            tmp = atoi(optarg);
        if (0 < tmp && tmp < 901){
            sleeptime = tmp;
        }
        break;
        default:
        break;
        }
    }

    printf("Megs_to_fill: %d Sleeptime: %d\n", megs_to_fill, sleeptime);
    allocs = 256 * 1024 * megs_to_fill;
    data = malloc (allocs * sizeof(int));
    if (data == NULL){
        printf("Not enough memory\n");
        return -1;
    }
    for (i = 0; i < allocs; i++){
        randomized = random() % INT_MAX;
//      printf("Filling data location %d with %d\n", i, randomized);
        data[i] = randomized;
    }
    printf("%dM filled, sleeping for %dsec\n", megs_to_fill, sleeptime);

    sleep(sleeptime);
    free(data);
    return 0;
}