mono/tests/sgen-cementing-stress.cs

   1 using System;
   2
   3 class PinList
   4 {
   5     class Pinned
   6     {
   7         public Pinned ()
   8         {
   9         }
  10     }
  11
  12     Pinned reference;
  13     PinList next;
  14
  15     PinList (PinList n)
  16     {
  17         next = n;
  18     }
  19
  20     static PinList MakeList (int length)
  21     {
  22         PinList l = null;
  23         for (int i = 0; i < length; ++i)
  24             l = new PinList (l);
  25         return l;
  26     }
  27
  28     static void AssignReferences (PinList l, Pinned[] objs)
  29     {
  30         int i = 0;
  31         int n = objs.Length;
  32         while (l != null)
  33         {
  34             l.reference = objs [i++ % n];
  35             l = l.next;
  36         }
  37     }
  38
  39     static Pinned Work (PinList list, Pinned[] objs, int i)
  40     {
  41         if (i >= objs.Length)
  42         {
  43             for (int j = 0; j < 10; ++j)
  44             {
  45                 MakeList (1 << 19);
  46                 AssignReferences (list, objs);
  47             }
  48             return null;
  49         }
  50         else
  51         {
  52             Pinned obj = new Pinned ();
  53             objs [i] = obj;
  54             Pinned dummy = Work (list, objs, i + 1);
  55             return obj != dummy ? obj : dummy; // to keep obj alive
  56         }
  57     }
  58
  59     static void Benchmark (PinList list, int n)
  60     {
  61         Pinned[] objs = new Pinned [n];
  62         Work (list, objs, 0);
  63     }
  64
  65     public static void Main ()
  66     {
  67         PinList list = MakeList (1 << 24);
  68         Console.WriteLine ("long list constructed");
  69         Benchmark (list, 10);
  70         GC.Collect (1);
  71         Benchmark (list, 100);
  72     }
  73 }