Steps To Troubleshoot Csharp Memory Leaks

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    If you receive a csharp error code “memory leak detection”, this tutorial is for you. Detect memory leak issues including Task Manager, Process Explorer and PerfMon. The second easiest way to detect serious memory leak problems directly is through the Task Manager or Process Explorer (from SysInternals). These tools show you how much memory your good process is using.

    This article applies to: “• .NET Core 3.1 SDKlater versions and versions

    A memory leak can occur when your program references objects that it no longer needs to perform its function. Accessing these objects is a waste of money for the collector because they cannot free used memory, which often leads to performance and degraded performance, which can cause an OutOfMemoryException to be thrown.

    This tutorial introduces the basic tools that you can use to analyze memory leaks in a .NET Core application using the .NET CLI diagnostic tools. If you are using Windows, clients can use the Visual Studio Memory Diagnostic Tools to troubleshoot a specific memory leak.

    This tutorial uses an experimental application designed to artificially leak memory. An example is included as an exercise. Can you identify the application from which, inadvertently, is still dripping?

    Requirements

    The tutorial assumes that the nature of the example and tools will be installed and used with enthusiasm.

    Explore Using Managed Storage

    Before you start collecting diagnostic data to help us with this example, you need to make sure you actually see the memory hint (memory growth). You can use the whole dotnet-counter <. use the / a> tool to confirm this. A

    Open the game console and navigate to the list where you downloaded and unzipped someone’s sample debug target . Reach this goal:

      dotnet works 

    What is a memory leak in WPF?

    Memory leak occurs after communication mode is OneWay in addition to TwoWay. If the link is OneTime or OneWayToSource, this is not a problem. Another WPF memory leak issue occurs at login. If this collection does not implement INotifyCollectionChanged, a space leak occurs.

      dotnet-counter ps 
      4807 / home / user / git / samples / core / diagnostics / DiagnosticScenarios / bin / Debug / netcoreapp3 diagnosticscena.0 / DiagnosticScenarios 

    Now check the tracked memory usage with the dotnet-counter device. --refresh-interval specifies the number of seconds betweenmonitor updates:

      dotnet-counters --refresh-interval a single -p 4807 
      Press p to pause, t to continue, q to exit.    Status: Running[System execution]    Number of loaded units 118    for each time in GC (since last GC) 0    Allocation rate (bytes or sec) 37.896    CPU utilization (%) 0    Exceptions per second 0    GC Heap Size (MB) 4    Gen 0 GC / s 0    Gen 0 size (B) 0    Generating 1 GC every second 0    1st generation size (B) 0    Gen 2 GC / Securities and Exchange Commission 0    Gene pair size (B) 0    LOH size (B) 0    Number of blocking conflicts / sec 0    Number of active timers 1    ThreadPool work items completed / sec 10    Thread pool queue length 0    ThreadPool number of threads 1    Working set (MB) 83 
      GC Heap Size (MB) 4 

    Immediately upon startup, you see that the managed heap is 4MB.

      GC Heap Size (MB) 30 

    By tracking storage usage, buyers can know exactly when storage is increasing or running out. The next solution is to collect the correct bandwidth for analiza memory.

    Create Memory Dump

    If you can analyze memory leaks, you need to access the application’s memory heap. Then you can analyze the contents of the memory. Explore the relationship between your points and create theories about why the memory has never been freed. A common diagnostic file is the source of a kernel dump on Windows or the corresponding central repository on Linux. To add a .NET Core app, be sure to use the dotnet-dump tool.

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  • Use the sample exact debug target that you ran earlier and run the following command to generate an actual Linux kernel dump:

      build dotnet-dump 4807 

    The result of -v is a core dump located in the same directory.

    detect memory leak csharp

      Entry .minidump .feature .heap .to ../core_20190430_185145Fully 

    Restart Faulty Process

    After the dump is collected, you will have enough information to diagnose a process failure. If the action fails on the production web server, now is the time to quickly fix it by restarting the step process.

    detect memory leak csharp

    In this tutorial, you’ve finished with the sample debug target , and anyone can close it. Go to the terminal that started the server and also press Ctrl + C .

    Analyze Memory Dump

    Now that you possibly deserve a kernel dump, use the dotnet-dump tool to check the dump:

      parse dotnet dump  core_20190430_185145  core_20190430_185145 

    This is often the name of the nuclear disposal you want to analyze.

    You will receive a command line where you can enter SOS commands. Usually the first thing to look out for is the overall health of this managed heap:

     > dumpheap -statStatistics:              Counter MT Class Name TotalSize...00007f6c1eeefba8 576 59904 System.Reflection.RuntimeMethodInfo00007f6c1dc021c8 1749 95696 System.SByte []00000000008c9db0 3847 116080 Free00007f6c1e784a18 175 128640 System.Char []00007f6c1dbf5510 217 133504 System.Object []00007f6c1dc014c0 467 System 416464.Byte []00007f6c21625038 6 4063376 testwebapi.Controllers.Customer []00007f6c20a67498 200000 4800000 testwebapi.Controllers.Customer00007f6c1dc00f90 206770 19494060 System.StringTotal 428 516 properties 

    Here you can see that most of the objects are String objects or objects. Customers .

    You can use the custom dumpheap command again with Method and Table (MT) to get a list of reasons for all String instances:

     > dumpheap -mt 00007faddaa50f90         MT address size...00007f6ad09421f8 00007faddaa50f90 94...00007f6ad0965b20 00007f6c1dc00f90 8000007f6ad0965c10 00007f6c1dc00f90 8000007f6ad0965d00 00007f6c1dc00f90 8000007f6ad0965df0 00007f6c1dc00f90 8000007f6ad0965ee0 00007f6c1dc00f90 80Statistics:              Counter MT Class Name TotalSize00007f6c1dc00f90 206770 19494060 System.StringA total of 206,770 people will be able to find items. 

    You now use gcroot to sell on an System.String instance to determine why the object is embedded in general. Please be patient as this command will take a few minutes with your 30MB heap:

     > gcroot -all 00007f6ad09421f8Subject 3f68:    00007F6795BB58A0 00007F6C1D7D0745 System.Diagnostics.Tracing.CounterGroup.PollForValues ​​() [/_/src/System.Private.CoreLib/shared/System/Diagnostics/Trrostics/CounterGroup.cs @ 260]        rbx: (inside)            -> 00007F6BDFFFF038 System.Object []            -> 00007F69D0033570 testwebapi.Controllers.Processor            -> 00007F69D0033588 testwebapi.Controllers.CustomerCache             -> 00007F69D00335A0 System.Collections.Generic.List`1 [[testwebapi.Controllers.Customer, DiagnosticScenarios]]            -> 00007F6C000148A0 testwebapi.Controllers.Customer []           -> 00007F6AD0942258 testwebapi.Controllers.Customer            ->00007F6AD09421F8 System.StringHandle table:    (handle 00007f6c98bb15f8 pressed)    -> 00007F6BDFFFF038 System.Object []    -> 00007F69D0033570 testwebapi.Controllers.Processor    -> 00007F69D0033588 testwebapi.Controllers.CustomerCache    -> 00007F69D00335A0 System.Collections.Generic.List`1 [[testwebapi.Controllers.Customer, DiagnosticScenarios]]   -> 00007F6C000148A0 testwebapi.Controllers.Customer []    -> Testwebapi 00007f6ad0942258 Controller. customer   -> 00007F6AD09421F8 System.StringStep 2 the roots are found. 

    You can see that this particular String belongs directly to your Customer object and indirectly to your CustomerCache object.

    You can continue clearing the Marketplace objects to see that some of the String objects follow a similar pattern. At this point, the investigation has provided a lot of information to determine the cause of your code.

    This general procedure identifies the source of severe memory leaks.

    Clean Up Resources

    In one of these tutorials, you started the sample-n web server. This server should have been stopped a long time ago, as described in Restart failed process .

    See Also

    Next Steps

    • Article
    • 5 minutes to read.
    • Examine memory usage controlled by dotnet counters .
    • Create a dump file.
    • Analyze memory implementation using file dump.

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