Demystifying Visual Studio 2012 Performance Tools

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Demystifying Visual Studio 2012 Performance Tools

Martin Kulov | kulov.net

www.devreach.com

You cannot manage,What you do not measure

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You cannot Improve,What you do not measure

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Operating System

Trace Analysis

HDD RAM CPU LAN

Win32 API

CLR WinRT

CPU Counters

COM

Our code

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CPU Counters

• Hardware events – portable and platform– Instructions Retired– Non Halted Cycles– ITLB Misses– Branches Retired– Mis-predicted Branches– L2 Cache Read Misses– L2 Cache Read References

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Operating System

Trace Analysis

HDD RAM CPU LAN

Win32 API

CLR WinRT Windows

Perf

Counters

CPU Counters

COM

Our code

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Windows Performance Counters

• They are …counters• Min interval – 1sec• Apps and kernel send Increment

signals• Accessed by Windows API

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Perf Counters Demo

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Operating System

Trace Analysis

HDD RAM CPU LAN

Win32 API

CLR WinRT Windows

Perf

Counters

CPU Counters

Event

Tracing

for

Windows

COM

Our code

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Event Tracing for Windows

• General purpose, high speed tracing• Buffering and logging in kernel• Faster than printf

– 20,000 events per second while only using 5% CPU load on a P3 500MHz!

• Provider, Consumer, Controller model• Over 700 providers in Win7, ~900 in

Win8!• Aggregates all sources• Stack walking (on kernel events)

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ETW Kernel Providers

• Hardware Configuration Events • Disk-level I/O • File-level I/O • Image Layouts• Page Faults• Network I/O • Registry I/O • Process and Thread info

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ETW Application Providers

• Windows Firewall• WLAN, LAN• USB, Bluetooth• IIS, ASP.NET, CLR, HTTP.SYS• Security• … many more

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ETW Demo

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Side note: Symbols

• _NT_SYMBOL_PATH=SRV*c:\mss*http://msdl.microsoft.com/download/symbols

• Call stack information• Private managed code fields• Link to source code repository

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Concurrency Visualizer

• Utilization• Threads• Cores• Stack Walking

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Operating System

Trace Analysis

HDD RAM CPU LAN

Win32 API

CLR WinRT Windows

Perf

Counters

CPU Counters

Event

Tracing

for

Windows

COM

Our code

Profiler

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Profiler

• Instrumentation• Sampling• Concurrency• Stack Walking

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Profiler setup

• There can be only one• Uses environment variables– COR_ENABLE_PROFILING– COR_PROFILER – COR_XXX…

• Profiler API

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Instrumentation

• Profiler based• Requires full code recompilation• Best during development phase• Complete execution path

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Sampling

• Profiler based• Data collection on sample intervals• Suitable for long runs• Call Stack

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Concurrency

• Show resource contention• Based on Detours• Microsoft Research project now sold

for $10k• http://research.microsoft.com/en-us/projects/deto

urs/

• Stack Walking

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Profiling extras

• GC, Allocation• Tier Interaction• JavaScript• Production use• Licensing

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Profiler Demo

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Thank you!@kulovwww.kulov.netwww.linkedin.com/in/kulov

Martin Kulov | kulov.net