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POFinding Memory leaks in C#
 

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  1. POFinding Memory leaks in C#
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    <p>In the following program the size of initial size of memory is not regained though garbage collection is performed. 1. Initial size of memory is Total memory: 16,940 bytes Private bytes 8134656</p> <ol> <li><p>Created objects within a loop so that these objects are freed when gc collect is done outside the loop as these objects don't have their scope. </p></li> <li><p>But the memory after GC collect is not same as the initial size Total memory: 29,476 bytes Private bytes 8540160 Handle count: 115</p></li> </ol> <p><p></p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MemoryLeakTest { class Program { static void DisplayMemory() { Console.WriteLine("Total memory: {0:###,###,###,##0} bytes", GC.GetTotalMemory(true)); Console.WriteLine("Private bytes {0}", System.Diagnostics.Process.GetCurrentProcess().PrivateMemorySize64); Console.WriteLine("Handle count: {0}", System.Diagnostics.Process.GetCurrentProcess().HandleCount); Console.WriteLine(); } static void Main() { DisplayMemory(); GC.Collect(); for (int i = 0; i &lt; 5; i++) { Console.WriteLine("--- New object #{0} ---", i + 1); object o = new object(); GC.Collect(); DisplayMemory(); } Console.WriteLine("--- press any key to quit ---"); Console.WriteLine(); Console.Read(); GC.Collect(); DisplayMemory(); } } } Output: ======= Total memory: 16,940 bytes Private bytes 8134656 Handle count: 115 --- New object #1 --- Total memory: 25,588 bytes Private bytes 8540160 Handle count: 115 --- New object #2 --- Total memory: 25,576 bytes Private bytes 8540160 Handle count: 115 --- New object #3 --- Total memory: 25,576 bytes Private bytes 8540160 Handle count: 115 --- New object #4 --- Total memory: 25,576 bytes Private bytes 8540160 Handle count: 115 --- New object #5 --- Total memory: 25,576 bytes Private bytes 8540160 Handle count: 115 --- press any key to quit --- Total memory: 29,476 bytes Private bytes 8540160 Handle count: 115 ********************************* </code></pre> <p>What is the reason for the increase in private bytes and managed heap size from their initial size?</p>
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    1. USIgor Ševo
    1. USuser186246
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      1. USArtur Udod
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      1. USAjay Kumar
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    1. COWhen the .NET Runtime reserves memory, it doesn't give it back right away when it's no longer actually using that memory -- nor should it.
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      1. POFinding Memory leaks in C#
      1. USGeorge Stocker
    2. COThis has been talked about on Stack Overflow before: http://stackoverflow.com/questions/1343374/reducing-memory-usage-of-net-applications
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      1. USGeorge Stocker
    3. COIf the private bytes gets increased and reserved like this then the other processes cannot use this memory as private bytes are not shared. Is this right?
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