Tess Ferrandez ASP.NET Escalation Engineer Microsoft Session Code: WIA402

Problem types Hangs and performance issues Memory leaks and high memory usage Crashes Exceptions

Tools and Resources WinDbg.exe and adplus.vbs (Included with Debugging Tools for Windows) SOS.dll (Included with.NET framework) Debug Diagnostics 1.1 Tinyget.exe (Included in the IIS Resource kit) Microsoft Visual Studio.NET 2010 Blog: If broken it is, fix it you should

Hangs and performance issues Idle hangs Waiting for external resources Waiting for locks/sync objects Busy hangs CPU Intensive operations High CPU in GC Application restarts

Step-By-Step 1.Reproduce problem 2.Look at perf data (CPU Usage etc.) 3.Get a memory dump (or two) 4.Examine threads a) (Idle) Find blocking calls or calls to external resources b) (Busy) Look for active threads

Memory leaks and high mem. usage Managed (.NET) Cache / Session Heavy Large Object Heap (LOH) usage Blocked finalizer GC heap fragmentation (pinning) Loader heap issues Dynamic assemblies Lots of apps in one app pool

Step-By-Step 1.Look at perf data (.NET / Native or Loader heap issue) 2.Get a memory dump (or two) 3.Check if the finalizer is blocked 4.Dump the.NET GC Heap and determine where the memory is going 5.Dump objects, or !gcroot them to see why they are not being collected

Crashes OutOfMemoryException StackOverflowException ExecutionEngineException.NET and Native Heap corruption Unhandled exceptions Recycling

Exceptions Tracing exceptions Dumping on exceptions

Step-By-Step 1.Check Event logs 2.Disable Recycling 3.Set up a Debug Diag rule to capture dumps on exceptions or crash 4.Reproduce 5.Look at stacks/exceptions in the dump (and/or in log files)

Sessions On-Demand & Community Resources for IT Professionals Resources for Developers Microsoft Certification & Training Resources Resources Required Slide Speakers, TechEd 2009 is not producing a DVD. Please announce that attendees can access session recordings at TechEd Online. Required Slide Speakers, TechEd 2009 is not producing a DVD. Please announce that attendees can access session recordings at TechEd Online.

Track Resources Blogs: Tools: Debugging tools for windows Debugging tools for windows Tinyget – IIS Resource Kit Tinyget – IIS Resource Kit Debug Diag 1.1 Debug Diag 1.1 Microsoft Visual Studio.NET 2010 Microsoft Visual Studio.NET 2010 Red Gate.NET Reflector Red Gate.NET Reflector Required Slide Track PMs will supply the content for this slide, which will be inserted during the final scrub. Required Slide Track PMs will supply the content for this slide, which will be inserted during the final scrub.

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