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VTune PerformanceAnalyzer 6.0
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VTune
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AGENDA
Introduction
Terminology
Sampling
Call Graph
Counter Monitor
VTune on Linux
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VTune Performance
Analyzer
Bottlenecks in algorithms
Bottlenecks due to data layout
Application architecture bottlenecks
System-Level and hardwarebottlenecks
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AGENDA
Introduction
Terminology
Sampling
Call Graph
Counter Monitor
VTune on Linux
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Hotspot?
Where in an application/system where thereis a significant amount of activity() Where = address in memory => OS process => OS
thread => executable file or Module=> user function(requires symbols) => line of source code (requiressymbols with line numbers) or processor (assembly)instruction.
Significant= if it doesnt happen often it probablydoesnt have much impact on the systemsperformance.
Activity= time spent or other internal processorevent.
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Hotspot? hotspot hotspotVTune hotspothotspot cachemiss
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HotspotBottleneck Bottleneck VTune Performance AnalyzerBottlenecks.HotspotsBottlenecks.
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sampling
call graph
counter monitor
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Two Ways to
Track Location Problem: Statistical Solution:30
Instrumentation Solution:
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The Statistical
Solution: I Call You! ADVANTAGES:
:
DISADVANTAGES:
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The InstrumentationSolution: You call me when
you get there! ADVANTAGES:
DISADVANTAGES:
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Hotspots Sampling Data Collector The Statistical
Solution
Call Graph Data Collector TheInstrumentation Solution
sampling
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VTune Projects
Project? ProjectActivities
Activity?
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Projects are organized like this:
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AGENDA
Introduction / Whats New in 6.0
Terminology
Sampling
Call Graph
Counter Monitor
VTune on Linux
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Sampling Technology
,1,000 Event Based Sampling(EBS).
L2 CacheMisses, Branch Mispredictions,
Floating-point instructions retired, etc.
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Lab 1: gzip Sampling
Analysis Introduces EBS and Sampling UI
gzip is an open source file
compression program
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Select New Project
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Select Sampling Wizard
and then OK
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Select Win32*/Win64*/Linux*Profiling radio button and then
OK
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Remember each Activity has itsown Application/Module Profile
1. Browse to theapplication:gzip.exe
2. The commandline argumentsare: -ftestfile.dat
3. Check Modify
defaultconfiguration
4. Click on Finish
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Modify the Sampling Activity
1. Select theSampling
check box.2. Click on
Configure
U h k C lib t S l Aft
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Uncheck Calibrate Sample AfterValue checkbox
Whydo
this?
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Click OK to run the activity
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hotspot
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AGENDA
Introduction / Whats New in 6.0
Terminology
Sampling Call Graph
Counter Monitor
VTune on Linux
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AGENDA
Introduction / Whats New in 6.0
Terminology
Sampling Call Graph
Counter Monitor
VTune on Linu
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hotspot
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AGENDA
Introduction / Whats New in 6.0
Terminology
Sampling Call Graph
Counter Monitor
VTune on Linux
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VTune on Linux
LinuxSampling DriverLinuxVTune serverWindows
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http://www.intel.com/software/product
s/college/vtune/getstart/tutorial/index.htm