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 
main(int argc,char * argv[])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