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https://github.com/tessferrandez/debuggingdemos
Demos for .NET Debugging Presentations
https://github.com/tessferrandez/debuggingdemos
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Demos for .NET Debugging Presentations
- Host: GitHub
- URL: https://github.com/tessferrandez/debuggingdemos
- Owner: TessFerrandez
- License: mit
- Created: 2017-04-21T12:50:37.000Z (over 7 years ago)
- Default Branch: prod
- Last Pushed: 2022-06-22T15:42:25.000Z (over 2 years ago)
- Last Synced: 2024-05-08T00:32:18.170Z (8 months ago)
- Language: C#
- Size: 4.07 MB
- Stars: 15
- Watchers: 3
- Forks: 3
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# DebuggingDemos
Demos for .NET Debugging Presentations
If you came here looking for debugging info or labs, check out my blog [https://www.tessferrandez.com](https://www.tessferrandez.com)
## Preparations
1. Install [DebugDiag](https://www.microsoft.com/en-us/download/details.aspx?id=49924)
2. Install [ProcDump](https://technet.microsoft.com/en-us/sysinternals/dd996900.aspx)
3. Install [WinDbg](https://msdn.microsoft.com/en-us/library/windows/hardware/ff551063(v=VS.85).aspx)
4. Download and compile [Netling](https://github.com/hallatore/Netling) easy load tester
5. In WinDbg, Set the sympath to srv\*c:\symcache\*https://msdl.microsoft.com/download/symbols and save workspace
Use magnifier with bar to manify command in windbg
### Capture demo dumps
1. Crash - Presidents demo - next on Obama
2. Crash - MyShop - Contact - Email=Test --- need to capture with a debug diag rule, dump on first chance stack overflow
3. Hang - MyShop - Products - Netling 8/10/1 (can take with taskmanager if you set up vdir in real IIS 64 bit)
4. Memory - MyShop - News - Netling 4/10/1 (take one baseline before and one leak after)
# Script
## Dump walkthrough
1. Open crash 1 in WinDbg
2. Add commands to scratchpad
3. Walk through commands and explain what we can find in a memory dump
~* kb
.loadby sos clr
!clrstack
!dso
!do
!objsize
!click
!gcroot
lm
!eeheap -gc
!dumpheap -stat
## Crash 1
1. Repro crash in presidents - next on Obama
2. Procdump -ma ThePresidents.exe -e
3. in Windbg !clrstack and !dso
4. Open in Debug Diag
- exception on stack 0
- stack of T0
- previous exceptions
- discuss SOF/OOM/EE
5. Open in Visual Studio (managed)
6. Open event viewer
(*) debug diag rules
## Hang 1
1. Browse to Products (MyShop)
2. Netling 8/10/1 + task manager (check CPU)
3. Netling again - dump with task manager
(*) Windbg - show lots of same stacks
4. Debug Diag
- show wait
- http context report
5. Visual studio (Mixed??)
- Parallel stacks
## Hang 2
1. Open presidents, show slowness on next
2. Analyze/Performance Profiler
- Performance wizard
- Instrumentation
3. Repro / Stop profiling
4. Summary - App.Run - move down path
## Memory 1
1. Browse news
2. dump for comparison
3. Netling 4/10/1
4. Dump leak
5. Open in VS
- sort by size diff bytes
- newscontroller root down
6. Open in Debug Diag
- see cache
(*) open in Windbg and debug with !gcroot etc.
Slides available on my [Slideshare](http://www.slideshare.net/TessFerrandez)