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 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