test/stress/eatmem.c

   1 /*
   2  * EATMEM.C
   3  *
   4  * (c)Copyright 2003 Matthew Dillon <dillon@backplane.com>.  This code is
   5  *    hereby placed in the public domain.
   6  *
   7  * This program 'eats' memory by allocating and touching it.  Make sure your
   8  * datasize resource limit is sufficient for the amount of memory you specify.
   9  *
  10  * $DragonFly: src/test/stress/eatmem.c,v 1.1 2003/08/25 21:41:00 dillon Exp $
  11  */
  12 #include <sys/types.h>
  13 #include <sys/mman.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17
  18 int
  19 main(int ac, char **av)
  20 {
  21     int bytes;
  22     int i;
  23     char *ptr;
  24
  25     if (ac == 1) {
  26         printf("eatmem MB [msec/page]\n");
  27         printf("specifying msec/page will cause eatmem to loop forever\n");
  28         exit(1);
  29     }
  30     bytes = strtol(av[1], NULL, 0) * 1024 * 1024;
  31     ptr = malloc(bytes);
  32
  33     for (;;) {
  34         for (i = 0; i < bytes; i += 4096) {
  35             ++ptr[i];
  36             if (av[2] && strtol(av[2], NULL, 0))
  37                 usleep(1000 * strtol(av[2], NULL, 0));
  38             if (i == 0)
  39                 puts("loop0");
  40         }
  41         if (ac != 3)
  42                 break;
  43         puts("loop");
  44     }
  45     puts("ok");
  46     sleep(10);
  47     puts("done");
  48     exit(0);
  49 }