1#include <stdio.h>
2#include <stdlib.h>
3
4#define NLIVE 1000000
5
6#define NITERS (3*1000*1000)
7
8char* arr[NLIVE];
9
10int 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