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Demystifying Visual Studio 2012 Performance Tools
Martin Kulov | kulov.net
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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
