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Windows 8 . NET Store Apps Debugging

Windows 8 . NET Store Apps Debugging. Mario Hewardt Senior Developer PFE. Objectives. Investigate a memory problem in a Windows 8 Store Application Learn how to quickly triage possible memory problems in .NET using PerfMon Learn how to control Windows 8 Process Lifetime Management

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Windows 8 . NET Store Apps Debugging

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  1. Windows 8 .NET Store Apps Debugging Mario Hewardt Senior Developer PFE

  2. Objectives • Investigate a memory problem in a Windows 8 Store Application • Learn how to quickly triage possible memory problems in .NET using PerfMon • Learn how to control Windows 8 Process Lifetime Management • Learn how to dig deeper into the managed heap to find root cause • Learn new .NET 4.5 debug switches for more efficient debugging

  3. Windows 8 and .NET Magic • No magic  • Just a new .NET version with an improved GC • BUT – PLM can throw you for a loop • Bottom line – Debugging applications under control of PLM can change your debugging experience

  4. .NET Memory Basics - SOH • Small object heap • < 85000 bytes • Compacted and beautiful • Few exceptions one common one is: Pinning

  5. .NET Memory Basics - LOH • Large Object heap • >= 85000 bytes • Not compacted • Recently released preview of .NET 4.5.1 includes the ability to compact LOH programmatically

  6. .NET Memory Basics – GC Modes • Server • Workstation • 4.0 Background (workstation) • 4.5 Background (server)

  7. The Memory Hogging Application • Application plays the XBox One ‘Reveal’ video • Complaint: Application uses excessive memory • Short video clip uses close to 1GB of memory

  8. Step 1 – Is it even a Problem?

  9. Step 2 – Windows 8 PLM • In previous versions of Windows, user controlled the lifetime of a process • In Windows 8, it itself can as well • Process Lifetime Management (PLM) component • Used as a means to conserve energy/battery

  10. PLM States Running Suspended Stopped

  11. PLM and Debugging • As a process transitions throughout the state machine, debugging can be effected • What happens if you attach when its suspended? • Key is to control the PLM policy • Rather, disable it when we debug

  12. Walkthrough

  13. Step 3 - Overview of Managed Heap

  14. Step 4 – Root cause

  15. Walkthrough • New switches to !DumpHeap command

  16. Q&A

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