1 #include <stdio.h> 2 #include <stdlib.h> 3 4 #define NLIVE 1000000 5 6 #define NITERS (3*1000*1000) 7 8 char* arr[NLIVE]; 9 10 int main ( int argc, char* argv[] ) 11 { 12 int i, j, nbytes = 0; 13 int pdb = 0; 14 int jpdb; 15 16 if (argc > 1) { 17 pdb = atoi(argv[1]); 18 } 19 20 printf("initialising\n"); 21 for (i = 0; i < NLIVE; i++) 22 arr[i] = NULL; 23 24 printf("running\n"); 25 j = -1; 26 for (i = 0; i < NITERS; i++) { 27 j++; 28 if (j == NLIVE) j = 0; 29 if (arr[j]) 30 free(arr[j]); 31 arr[j] = malloc(nbytes); 32 if (pdb > 0) { 33 // create some partially defined bytes in arr[j] 34 for (jpdb=0; jpdb<nbytes; jpdb = jpdb+pdb) { 35 arr[j][jpdb] &= (jpdb & 0xff); 36 } 37 } 38 39 // Cycle through the sizes 0,8,16,24,32. Zero will get rounded up to 40 // 8, so the 8B bucket will get twice as much traffic. 41 nbytes += 8; 42 if (nbytes > 32) 43 nbytes = 0; 44 } 45 46 for (i = 0; i < NLIVE; i++) 47 if (arr[i]) 48 free(arr[i]); 49 50 printf("done\n"); 51 return 0; 52 } 53
