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