1 /* $FreeBSD$ */
2 #include <stdlib.h>
3 #include <stdio.h>
4 #include <string.h>
5 #include <unistd.h>
6
7 u_long NBUCKETS = 2000;
8 u_long NOPS = 200000;
9 u_long NSIZE = (16*1024);
10
11 char **foo;
12
13 int
main(int argc,char ** argv)14 main(int argc, char **argv)
15 {
16 u_long i,j,k;
17
18 if (argc > 1) NOPS = strtoul(argv[1],0,0);
19 if (argc > 2) NBUCKETS = strtoul(argv[2],0,0);
20 if (argc > 3) NSIZE = strtoul(argv[3],0,0);
21 printf("BRK(0)=%p ", sbrk(0));
22 foo = malloc(sizeof(*foo) * NBUCKETS);
23 memset(foo, 0, sizeof(*foo) * NBUCKETS);
24 for (i = 1; i <= 4096; i *= 2) {
25 for (j = 0; j < 40960/i && j < NBUCKETS; j++) {
26 foo[j] = malloc(i);
27 }
28 for (j = 0; j < 40960/i && j < NBUCKETS; j++) {
29 free(foo[j]);
30 foo[j] = NULL;
31 }
32 }
33
34 for (i = 0; i < NOPS; i++) {
35 j = random() % NBUCKETS;
36 k = random() % NSIZE;
37 foo[j] = realloc(foo[j], k & 1 ? 0 : k);
38 if (k & 1 || k == 0) {
39 /*
40 * Workaround because realloc return bogus pointer rather than
41 * NULL if passed zero length.
42 */
43 foo[j] = NULL;
44 }
45 if (foo[j])
46 foo[j][0] = 1;
47 }
48 printf("BRK(1)=%p ", sbrk(0));
49 for (j = 0; j < NBUCKETS; j++) {
50 if (foo[j]) {
51 free(foo[j]);
52 foo[j] = NULL;
53 }
54 }
55 printf("BRK(2)=%p NOPS=%lu NBUCKETS=%lu NSIZE=%lu\n",
56 sbrk(0), NOPS, NBUCKETS, NSIZE);
57 return 0;
58 }
59