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virtual memory is not released in asp.net

Posted By:      Posted Date: August 28, 2010    Points: 0   Category :.NET Framework
We are getting OutOfMemoryException in our Asp.Net WebService (on a 32 bit machine) and while analyzing the problem we found that when we release some memory in .Net (and call GC just to be sure it is collected), the "Process/Private Bytes" counter of the aspnet_wp goes down, but the "Process/Virtual Bytes" does not. Here is a simple test method: It allocates blocks of 10MB until all the memory is filled. Then it releases everything and finally allocates a 100MB block. (The sleep statements are there so you can observe memory usage in performance monitor)     [WebMethod]     public void MemFragmentationTest()     {       const int allocSize = 10000000;  // 10 MB       List<byte[]> buffers = new List<byte[]>();       // allocate       while (true)       {         try         {           buffers.Add(new byte[allocSize]);           Thread.Sleep(100);         }         catch (OutOfMemoryException)         {  &n

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