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Diagnosing issues in your ASP.NET applications in production with Visual Studio 2012
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Diagnosing issues in your ASP.NET applications in production with Visual Studio 2012

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  • 1. Diagnosing issues in your ASP.NETapplications in production with VisualStudio 2012Brad Sullivanbrads@microsoft.com
  • 2. Agenda• Challenges in Production• Visual Studio Tools • Remote Debugger • IntelliTrace • Dump Debugger • Profiler• Sources and Symbols
  • 3. Challenges in Production• Can’t reproduce the issue in a development environment• Can’t run Visual Studio on the production machine • Possibly very limited developer access to production machines• Want to minimize impact to the server • Performance • Availability • Security
  • 4. Remote Debugger: The Big Hammer• Advantages • Often the fastest way to resolve an issue • Xcopy deployable (%ProgramFiles%Microsoft Visual Studio 11.0Common7IDERemote Debugger) • Configurable Authentication• Disadvantages • Your service becomes unresponsive if you are stopped in the debugger • Requires some firewall configuration
  • 5. Remote Debugger TCP/IP
  • 6. Improvements in Visual Studio 2012• Single Firewall Configuration (Remote Debugger Side)• Can connect across different domains• Symbols load from the Visual Studio side • No need to copy symbol files to your production machine• Faster• No need to choose between x86 and x64
  • 7. IntelliTrace• A “Back-in-Time” debugger• Configurable logging to trace the state of an application over time• Integrated with the Visual Studio Debugger UI for analysis• Can be run either locally or via command line
  • 8. IntelliTrace in Production• Download the IntelliTrace Collector http://www.microsoft.com/en-us/download/details.aspx?id=30665• Run it on your production machine • Pick a collection plan • Target the application • Reproduce the issue• Bring the IntelliTrace log back to your development machine• Analyze in Visual Studio to find the bug
  • 9. IntelliTrace Collection Plans• 2 Default Levels • Calls • Events• Custom? • Requires Editing XML • Can turn individual events on/off • Can include/exclude modules • Change max log file size
  • 10. Impact on Server Performance• Depends on a number of factors • Number of events collected • Number of modules included in application (startup jitting costs) • Calls data collection • IO
  • 11. System Center• IntelliTrace is integrated with System Center 2012 SP1 – Operations Manager• Application Performance Monitoring now available in an IntelliTrace format• IntelliTrace Profiling Management Pack allows you to collect IntelliTrace logs directly from the Operations Manager console
  • 12. Dump Files• Snapshots of the application at a single point in time• Two major types • With Heap – allows full inspection of the state of the app at that point in time • Without Heap – only allows for inspection of the callstacks across all threads• Can be opened directly in VS and debugged just like a regular application • Except no stepping…
  • 13. Creating Dump Files in Production• Several tools available that can create dump files, including Visual Studio• ProcDump has many qualities that make it ideal for production use • Command line • Xcopy deployable • Provides triggers for dump collection • CPU usage • Memory usage • Exceptions (with filters) • Low impact on system performance • Available through Microsoft SysInternals: http://technet.microsoft.com/en-us/sysinternals/dd996900.aspx
  • 14. Performance Profiler Overview• CPU Sampling • Shows what parts applications are executing the most frequently• Instrumentation • Records how long functions take to execute and how many times they are executed• .NET Memory Allocation • Tracks what objects are being allocated• Resource Contention • Tracks when threads are contending for the same resource causing slowdowns• Tier Interaction Profiling • Records database queries that go through ADO.NET
  • 15. Profiling Use• Can be run locally from the IDE• Can be run in production on the command line • Standalone installer included in the Visual Studio Install • “VS_INSTALL_DIRECTORYTeam ToolsPerformance ToolsSetups”• Tier Interaction Profiling • Find performance bottlenecks caused by how your application uses your database • Is used simultaneously with another profiling method (e.g. instrumentation)
  • 16. Symbols (PDBs)• The debugger, profiler, and IntelliTrace all need symbols to function properly• Symbols provide a mapping between the binaries you are analyzing and the source code that produced them • Also provide information for determining the local variables for a function• Symbol files must exactly match the build that you are diagnosing• It is easy for your development environment to get out of sync with what is in production
  • 17. Source Indexing• Embeds a command into the symbol file for each source file indexed• Diagnostic tools execute this command to fetch the source file Exact Match
  • 18. Improved User Experience Better configuration when retrieving indexed sources • Trust a whole symbol file • Trust all symbol files
  • 19. Using TFS Build• Use TFS build definitions to save symbols and index sources• Builds that are released to production should be saved indefinitely
  • 20. More Info About DiagnosticsALM Team Blog: http://blogs.msdn.com/b/visualstudioalm/
  • 21. Request FeaturesUservoice site: http://visualstudio.uservoice.com/