slideshow of intel vtune

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ISASOn

April 11, 2023

Tukuna Rout

Presenter

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Contents Introduction Features of Intel VTune

Sampling Call graph

Counter Monitor Tuning Assistant

Conclusion

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Introduction• Intel VTune is software from Intel used by the development

companies to analyze their software's and applications performance.

• It also provides boost performance of applications.

• One can work with the VTune analyzer using the graphical

interface and command line interface.

• The VTune(TM) Performance Analyzer can analyze the

performance of Linux applications, Java application

and .NET Applications.

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Features of IntelVTune

These are the four features of Intel VTune

Sampling Call graph Counter Monitor Tuning Assistant

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Sampling

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• It is collecting a set of data for analysis

and representing the analyzed data in a

statistical format.

• Calculates the actual performance of an

application over a period of time and for

various processor events.

• It monitors all the software executing on

your system including the operating

system, JIT-compiled Java applications

and .NET applications.

• Sampling does not modify binary files or

executables.

• It helps us to identify:- Hotspots and

Bottlenecks.

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Sampling Mechanism

• TIME-BASED SAMPLING (TBS):-

• EVENT-BASED SAMPLING (EBS): -

Difference Between TBS and EBS

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WHAT HAPPENS DURING SAMPLING Waits for the delay sampling

time. Interrupts the processor. Stores the execution.FEATURES OF SAMPLING

Collection - Multiple event sampling Remote sampling Collect sampling

Diff. between EBS & TBS

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Views - Thread view Summary view Process view Module view

Accessories – Sampling toolbar Tabbed windows Microsoft Excel Selection Summary panel Event summary panel Multi-processor

Call graph

Introduction

The call graph collector of the VTune(TM) Performance Analyzer collects information about the program flow of an application, that is, the number of function calls to some other function and the amount of time each function spent executing its code and/or calling other functions.

Identifying Critical Path The Critical path is the most time-consuming path in a call sequence of an application.

Critical paths can be identified by using call graph.

In a Call graph, critical paths are displayed with a thick red edge and it starts from the thread.

Features of Call graph

Collection Views Accessories

Features of Call graph Contd..

Collection Manual Launching Mode DLL-level Data Collection Instrumentation Filtering Multi-thread, Multi-process COM Tracing

Features of Call graph Contd..

Views

Intel VTune displays the Results of call graph in following three types of views.

Graph View Call list View Functional Summary

Features of Call graph Contd..Graph View

The graph view displays the graphical structure of the application.

It displays the Caller function, Calee function and Time information.

Features of Call graph Contd..Call list View

This view consists of three functions such as Caller function, Calee function and Focus function. It displays information about time and calls of the focus function.

Features of Call graph Contd..Function Summary View

Provides full information on all the application functions in the table format. The rows in the function summary display functions with different background colors according to the hierarchical position.

Features of Call graph Contd..

The function summary view contains:-

Calls Wait Time Total Wait Time Self Time Total Time

Features of Call graph Contd..

Accessories

Filtering option Function Details Unified Java support Timing Option Command Access

Counter Monitor

IntroductionCounter Monitor identifies system-level issues in applications. It is used to track system activities when the application runs on the system.

Counter Monitor collects data for specific performance counter data, such as that of an application, an OS, or a hardware device at different intervals of time. The counter monitor collector monitors and graphically displays the performance counter data.

Features of Counter Monitor

Collection Views Accessories

Features of Counter Monitor Contd..

Collection Trigger Mechanism:- Create triggers to monitor hardware and software counters at predetermined intervals according to criteria that is set.

Features of Counter Monitor Contd..

Views

Runtime Data View Logged Data View Legend Data View Summary Data View

Features of Counter Monitor Contd.. Runtime Data View:- During runtime, the VTune analyzer generates a graph that shows changes as they happen.

Logged Data View:- Displays data logged during an Activity.In the Logged Data view, data from each counter selected for logging is charted with a separate line and color.

Features of Counter Monitor Contd..

Legend View:- . Each line includes a distinct legend symbol for the corresponding counter, representing the point at which data was taken. The vertical Y axis represents counter values (scaled or actual), while the corresponding time is displayed on the horizontal X axis.

Features of Counter Monitor Contd..

Summary Data View:- Displays a statistical view of the counter data.

Features of Counter Monitor Contd..

Accessories

Control Charts:- . Choose a chart style best suited to the data you want to view using the Chart FX Properties.

Working of Counter Monitor

Tuning Assistant

Introduction

The Intel(R) Tuning Assistant provides advice on tuning your system resources and application performance.

Using its multiple knowledge bases, the Tuning Assistant analyzes the data collected by the VTune(TM) Performance Analyzer, identifies performance issues, and provides insights and tuning advice.

Tuning Assistant Concept

Work Load Insight Advice Relevance Score

Features of Tuning Assistant Contains knowledge bases to support Hyper-Threading Technology.

Enables you to compare two or three Activity results.

Provides links from function names directly to the corresponding code section in source view when you provide symbol information Provides advice on performance counter data and disassembly code

Provides static assembly advice.

Understanding Tuning Methodology

System-Level Tuning:– The main objective of system-level tuning is to optimize the utilization of system resources. The tuning speeds up application performance by improving the way the application interacts with the system. This tuning is effective for I/O applications.

Application-Level Tuning- The main purpose of application-level tuning is to reduce the execution time of an application. This can be achieved by improving the algorithms of the applications, implementing threads, and by using APIs.

Micro architecture- Level Tuning- Increases the performance of application by improving the way an application runs on a processor. This type of tuning is used with processor-intensive applications.

STRATEGIES FOR IMPROVING PERFORMANCE OF APPLICATION

Balancing input-output

Improving Threading Model

Improving effi ciency of computation

Types of Advice Sampling-based Advice:- Tuning assistant automatically analyzes the sampling data, identifies performance issues, and provides insights on the issues

Counter Monitor-based Advice:- Tuning assistant performs counter analysis based on all counters measured in activity.

Source-based Advice:- TA uses a compiler technology for source-based advice, which enables you to speed up the execution of code. But it is limited to C,C++ and Java applications.Static Assemble Penalties:-

Information That Tuning Assistant Provides

Insights

Relevance Scale

Tuning Assistance Advice

InsightsIt indicates the problem that could be hindering the performance of the application. Various categories of insights are:-

Top Insights Workload Insights Module Insights Hotspot Insights System Info Static Analysis

Information That Tuning Assistant Provides

Relevance ScaleIndicates the relevance of the insight or advice to a

particular performance issue.

Tuning Assistant AdvicePossible solution to remove or avoid a problem.

(More Information Window of Tuning Assistance Advice)

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