08 intel v_tune_session_11

Code Optimization and Performance Tuning Using Intel VTune
Installing Windows XP Professional Using Attended Installation

Objectives

In this session, you will learn to:
Obtain Tuning Advice Reports

Ver. 1.0 Slide 1 of 19


Getting Tuning Advice Reports

Tuning assistant displays information about possible
solutions in the form of tuning advice reports.
Tuning advice report:
Provides information about performance-related issues and
insights on the causes of the issues.
Provides you with a detailed description of suggestions or
insights.
Each insight includes links that enable you to obtain more
information about the insight.
The tuning assistant displays the tuning advice report for
event-based sampling results and counter monitor results.



Obtaining Tuning Advice Reports For Event-Based Sampling

Tuning assistant is available for only event-based sampling
data and not for time-based sampling data.
When you invoke tuning assistant for event-based sampling
data, the tuning advice report:
Indicates the problems.
Suggests solutions for each selected module, process, or
function in the sampling view.



Obtaining Tuning Advice Reports For Event-Based Sampling (Contd.)

To start using tuning advice reports for sampling data, you
need to:
Invoke the sampling wizard
Set the levels of analysis of sampling data
Set options for sampling activity results
Analyze the insights and tuning advice




You can select the Automatically Generate Tuning Advice
check box in the sampling wizard to obtain the tuning advice
report.
Alternatively, you can select the Get Tuning Advice option
from the View menu option on the menu bar to invoke the
tuning assistant.




Set the levels of analysis:
► One sampling run with minimal advice
► A few sampling runs with some advice
► Many sampling runs with more advice
This option enables you to instruct the sampling
collector to monitor only the events associated with
used for:
the clockticksapplication level tuning
In-depth per instruction retired.
Basic application level tuning
In thisBasic microarchitectural-levelreport contains a small
case, the tuning advice tuning
amount of advice for specified events.




The various categories of insights that you can view in a
tuning advice report are:
► Top insights These are insights that are estimated to have
significant impacts on performance.
► Workload insights These are performance issues for all modules
Performance impact enables you to identify the
and processes
► Module insights Insights on performance issues for achieve for
maximum optimization that you canthe modules
in an application
the application.
► Hotspots insights These are insights on performance issues based
on functions that are sorted by percentage of
► System info Summarizes the features that the system uses,
CPU time.
such as the speed ofinformation about possible
Enables you to view the processor and the
► Static analysis name of the operating system
optimizations to improve application
performance



Just a minute

What is tuning advice?

Answer:
Tuning advice is a possible solution to remove a performance
problem.



Just a minute

What is an insight?

Answer:
An insight is a performance issue that can act as a bottleneck
to the performance of an application.



Obtaining Tuning Advice Reports For Counter Monitor Data

Tuning assistant enables you to analyze the results of the
counter monitor data in counter view.
Tuning assistant creates a tuning advice report that
describes potential bottlenecks to application performance.
The tuning advice report for the results of counter monitor
data also provides suggestions on avoiding or removing the
performance issues.



Just a minute

What is relevance score?

Answer:
Relevance score indicates relevance of a particular insight or
advice.



Activity: Analyzing Data Using the Tuning Advice Report – 1

Problem Statement:
Jim Lewis, a software developer, has developed an application
in C#, MyApp, which involves the use of a two-dimensional
matrix. He needs to analyze the performance of the application
by collecting sampling-based data. Jim wants to invoke tuning
assistant to view the tuning advice report. In addition, Jim
needs to analyze and identify the performance issues in the
application. He also needs to analyze the advice on
performance issues using the tuning advice report. How will
Jim perform this task?



Activity: Analyzing Data Using the Tuning Advice Report – 1 (Contd.)

Solution
To analyze the performance of the application by collecting
sampling-based data and using tuning assistant, you need to
perform the following tasks:
1. Collect sampling-based performance data.
2. Invoke tuning assistant and analyze tuning advice and insights for
sampling data.



Activity: Analyzing Data Using the Tuning Advice Report – 2

Problem Statement:
Chris has developed an application in Java, which involves the
use of a two-dimensional matrix. However, on execution, he
finds that his application is performing very slowly. Therefore,
he decides to analyze the performance of his application by
collecting sampling-based data. In addition, he also wants to
invoke the tuning assistant to get the tuning advice report. Help
Chris to accomplish his task.



Activity: Analyzing Data Using the Tuning Advice Report – 2 (Contd.)

Solution
To analyze the performance of the application by collecting
sampling-based data and using tuning assistant, you need to
perform the following tasks:
1. Collect sampling-based performance data.
2. Invoke tuning assistant and analyze tuning advice and insights for
sampling data.



Comparing Activity Results

To optimize the application, you can compare multiple
activity results.
Comparing the results enables you to identify the
best-optimized code and enhance application performance.



Summary

• In this session, you learned that:
The tuning assistant displays information about possible
solutions in the form of tuning advice reports.
The two types of tuning advice reports that the tuning assistant
displays are:
• Event-based sampling activity results
• Counter monitor activity results
To start using tuning advice reports for sampling data:
Invoke the sampling wizard
Set the levels of analysis of sampling data
Set options for sampling activity results
Analyze the insights and tuning advice



Summary (Contd.)

The various categories of insights that you can view in a tuning
advice report for event-based sampling activity are:
• Top insights
• Workload insights
• Module insights
• Hotspots insights
• System info
• Static analysis
• The tuning assistant enables you to analyze the results of the
counter monitor data in the counter view.
• The tuning advice report for the results of counter monitor data
also provides suggestions on avoiding or removing the
performance issues.
• The tuning assistant enables you to compare the performance
of an application across multiple activity results.



Summary (Contd.)

The tuning assistant enables you to compare sampling activity
results across the same or different architectures.


08 intel v_tune_session_11

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