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 19:41:00 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 #include <unistd.h>
  18
  19 int
  20 main(int ac, char **av)
  21 {
  22     size_t bytes;
  23     size_t i;
  24     char *ptr;
  25
  26     if (ac == 1) {
  27         printf("eatmem MB [msec/page]\n");
  28         printf("specifying msec/page will cause eatmem to loop forever\n");
  29         exit(1);
  30     }
  31     bytes = strtoul(av[1], NULL, 0) * 1024 * 1024;
  32     ptr = malloc(bytes);
  33
  34     for (;;) {
  35         for (i = 0; i < bytes; i += 4096) {
  36             ++ptr[i];
  37             if (av[2] && strtol(av[2], NULL, 0))
  38                 usleep(1000 * strtol(av[2], NULL, 0));
  39             if (i == 0)
  40                 puts("loop0");
  41         }
  42         if (ac != 3)
  43                 break;
  44         puts("loop");
  45     }
  46     puts("ok");
  47     sleep(10);
  48     puts("done");
  49     exit(0);
  50 }