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