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Common production issues rev

Debugging .net issues - Presentation for TechEd EMEA 2008

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Common production issues rev

  1. 1. 2 Common ASP.NET production issues and how to troubleshoot them with WinDbg Tess Ferrandez - Norlander Support Escalation Engineer Microsoft Session Code: WUX405
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  8. 8. 9 We will be using BuggyBits from Debugging Tools for Windows SOS.dll Task Manager Visual Studio Team System Test TinyGet Performance Monitor Our brains
  9. 9. 10 Performance issues Low CPU => waiting for external resources and/or locks High CPU => busy server, infinite loops or high CPU in GC
  10. 10. 11 Performance issues
  11. 11. 12 Performance issues High or Low CPU? Get memory dump(s) Look at threads VSTS Test and Profiling is good if you can repro in a test environment
  12. 12. 13 Crashes Recycling Unhandled exceptions Stack overflow Fatal Execution Engine Exceptions Heap Corruption Out of memory
  13. 13. 14 Crashes and Exceptions
  14. 14. 15 Crashes and Exceptions Check out the eventviewer Disable recycling options Get memory dump(s) Look at faulting stacks or logs if neccesary Use TrackClr.cfg to track exceptions during testing
  15. 15. 16 High memory usage and OOM Caching and Session State “Unexpected roots” Blocked finalizer DataSet serialization Large viewstate Assembly leaks with XmlSerializer Pinned objects
  16. 16. 17 Memory
  17. 17. 18 High memory usage and OOM What are you leaking? (native, .net, assemblies) Take multiple dumps when memory is raising and compare Check the finalizer Check the Large object heap Try to group “leaking” objects Figure out why they are sticking around (rooted)
  18. 18. 19 Remember... There are tools out there to track down these types of issues Track exceptions during testing with TrackCLR.cfg Debugging Tools for Windows
  19. 19. Tech·Talks Tech·Ed Bloggers Live Simulcasts Virtual Labs Developer’s Kit, Licenses, and MORE! Resources for Developers
  20. 20. Related Content http://blogs.msdn,.com/tom
  21. 21. TLA05-IS Debugging Performance Issues, Memory Issues and Crashes in .net Applications Track Resources
  22. 22. Complete an evaluation on CommNet and enter to win! 1 Year Subscription!
  23. 23. 24 © 2008 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.