Debugging memory leaks, hangs, performance issues and crashses in .net applications on Windows or Linux with Windbg, dotnet dump and other tools

1. TESS FERRANDEZ

2. @TESSFERRANDEZ
DEVELOPER
EX ASP.NET SUPPORT

3. HIGH MEMORY USAGE BAD PERFORMANCE CRASHES & EXCEPTIONS
@TESSFERRANDEZ

5. CAN’T F5 DEBUG
LINUX OR MAC
INTERMITTENT
ONLY ON AZURE
@TESSFERRANDEZ

6. SOME .NET INTENALS
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7. HIGH MEMORY USAGE

8. WHAT’S USING UP THE MEMORY?
WHY ISN’T IT GOING AWAY?
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9. HIGH MEMORY USAGE + LINUX
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11. DOTNET COUNTERS
DOTNET GCDUMP
DOTNET DUMP
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12. WWW.TESSFERRANDEZ.COM

13. GC MEMORY LAYOUT
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14. GITHUB.COM/
MAONI0/MEM-DOC

15. ROOTS
THREADS
STATIC OBJECTS
CACHE
PINNED OBJECTS
FINALIZER QUEUE
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16. HIGH MEMORY USAGE - PART II
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17. public class Link
{
public StringBuilder url = new StringBuilder();
public string text;
public Link(string text, string url)
{
this.text = text;
this.url.Append(url);
}
~Link(){}
}

18. WHAT’S USING UP THE MEMORY?
WHY ISN’T IT GOING AWAY?
@TESSFERRANDEZ

19. WINDBG
DOTNET SYMBOLS
DOTNET SOS
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20. GENERATIONS
0 1 2
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21. LARGE OBJECT HEAP

22. BAD PERFORMANCE

23. WHAT ARE WE DOING?
WHY IS IT TAKING SO LONG?
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24. HIGH CPU + AZURE
TESSFERRANDEZ

25. str += "world";
str += "!";
string str = "hello";

26. DEBUG DIAG
AZURE DIAGNOSTICS
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27. LOW CPU + DEBUG WITH VS
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28. VISUAL STUDIO
PROCDUMP
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29. CRASHES AND EXCEPTIONS

30. WHAT JUST HAPPENED?
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32. CRASH + WER
TESSFERRANDEZ

33. WWW.TESSFERRANDEZ.COM