Persistent Dictionary

Key Features:
A data structure implementation similar to Dictionary in .NET.
- Writes objects to file system to preserve the memory
- Hold keys/locations in memory
- Retrieves any object by passing key in less than five milliseconds
Output, with 10000 inserts/updates/deletes:

Memory profiling:

   1: using (CPersistentDictionary lst = new CPersistentDictionary(@"C:\persist.kkhan"))

   2: {

   3:     Stopwatch timer = new Stopwatch();

   4:  

   5:     //1. Insert/update items

   6:  

   7:     int threshold = 10000;

   8:     timer.Start();

   9:     for (int i = 0; i < threshold; i++)

  10:     {

  11:         lst.Add("Counter" + i.ToString(), i.ToString());

  12:     }

  13:     timer.Stop();

  14:     Console.WriteLine("Items processed(add):{0}", threshold);

  15:     Console.WriteLine("Time elapsed in (ms):{0}  ({1} secs)", timer.ElapsedMilliseconds, TimeSpan.FromMilliseconds(timer.ElapsedMilliseconds).Seconds);

  16:  

  17:  

  18:     //2. Read items

  19:     timer.Start();

  20:     for (int i = 0; i < threshold; i++)

  21:     {

  22:         var o = lst["Counter" + i.ToString()];

  23:     }

  24:     timer.Stop();

  25:     Console.WriteLine("Items processed(read):{0}", threshold);

  26:     Console.WriteLine("Time elapsed in (ms):{0}  ({1} secs)", timer.ElapsedMilliseconds, TimeSpan.FromMilliseconds(timer.ElapsedMilliseconds).Seconds);

  27:  

  28:  

  29:     //3. Remove items

  30:     timer.Start();

  31:     for (int i = 0; i < threshold; i++)

  32:     {

  33:         lst.Remove("Counter" + i.ToString());

  34:     }

  35:     timer.Stop();

  36:     Console.WriteLine("Items processed(Remove):{0}", threshold);

  37:     Console.WriteLine("Time elapsed in (ms):{0}  ({1} secs)", timer.ElapsedMilliseconds, TimeSpan.FromMilliseconds(timer.ElapsedMilliseconds).Seconds);

  38:  

  39:  

  40:  

  41:     Console.ReadKey();

  42: }

 http://persistentdictionary.codeplex.com