Intel® Advisor Tutorial: Use the Automated Roofline Chart to Make Optimization Decisions

Tutorial

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

Visual Studio* IDE:
Prepare the Sample Application

This topic is part of a
tutorial
 that shows how to use the automated
Roofline
 chart to make prioritized optimization decisions.
Follow these initial steps if you prefer to use the
Intel Advisor
 plug-in to the Visual Studio* IDE try out the
roofline_demo_samples
 sample application.

Get Software Tools and Unpack the Sample Application

You need the following tools:
  • Intel Advisor
     installation package and license
  • Version 15.x or higher of the
    Intel® C++ Compiler Classic
     or a supported compiler
    Use an Intel compiler to get more benefit (and version 17.x or higher to get the most benefit) from the
    Vectorization Advisor
     
    Survey Report
    . See the
    Release Notes
     for more information on supported compilers.
  • .zip
     file extraction utility
If you do not already have the
Intel Advisor
 or the
Intel® C++ Compiler Classic
, download it from https://software.intel.com/content/www/us/en/develop/tools.html.
To set up the
roofline_demo_samples
 sample application:
  1. Download both the sample code and sample results to a writable directory or share on your system.
  2. Extract the sample code and sample results from the
    .zip
     files.

Open the Visual Studio* Solution

  1. Launch the Visual Studio* IDE.
  2. If necessary, choose
    View
    Solution Explorer
    .
  3. Choose
    File
    Open
    Project/Solution
    .
  4. In the
    Open Project
     dialog box, open the
    roofline_demo_samples.sln
     file.

Prepare the Project

To follow along with this
tutorial
:
  1. Make sure the project name in the
    Solution Explorer
     says
    roofline_demo_samples (Intel C++ [version])
    . If not, right-click the
    roofline_demo_samples
     project in the
    Solution Explorer
    , then choose
    Intel Compiler
    Use Intel C++
    .
  2. If the
    Solutions Configuration
     drop-down on the Visual Studio*
    Standard
     toolbar is set to
    Debug
    , change it to
    Release
    .
  3. Right-click the
    roofline_demo_samples
     project in the
    Solution Explorer
    , then choose 
    Properties
    .
  4. Choose 
    Configuration Properties
    C/C++
    General
    . Ensure
    Debug Information Format
     is set to
    Program Database (/ZI)
    .
  5. Choose 
    Configuration Properties
    C/C++
    Optimization
    . Ensure
    Optimization
     is set to
    Maximum Optimization (Favor Speed) (/O2)
    .
  6. Choose 
    Configuration Properties
    C/C++
    Optimization [Intel C++]
    . Ensure
    Parallelization
     is set to
    No
    .
  7. Choose 
    Configuration Properties
    C/C++
    Code Generation
    . Ensure
    Enable Enhanced Instruction Set
     is set to
    Intel(R) Advanced Vector Extensions 2 (/arch:CORE-AVX2)
    .
  8. Click the
    Apply
     button, then click the
    OK
     button.
  9. Choose
    Build
    Clean Solution
    .
  10. Choose
    Build
    Rebuild Solution
    .
To display the
Intel Advisor
 Workflow and Analysis Results, click the icon on the
Intel Advisor
 toolbar or click
Tools
 >
Intel Advisor [version]
 >
Vectorization and Threading Advisor Analysis
.
To build your own applications to produce the most accurate and complete
Vectorization Advisor
 analysis results, build an optimized binary in release mode using the following settings.
To Do This
Optimal C/C++ Settings
Request full debug information (compiler and linker).
Linux* OS command line:
-g
Windows* OS command line:
  • /ZI
  • /DEBUG
Microsoft Visual Studio* IDE:
  • C/C++
    General
    Debug Information Format
    Program Database (/Zi)
  • Linker
    Debugging
    Generate Debug Info
    Yes (/DEBUG)
Request moderate optimization.
Linux* OS command line:
-O2
 or higher
Windows* OS command line:
/O2
 or higher
Visual Studio* IDE:
C/C++
Optimization
Optimization
Maximum Optimization (Favor Speed) (/O2)
 or higher
Produce compiler diagnostics (necessary for version 15.0 of the Intel compiler; unnecessary for version 16.0 and higher).
Linux* OS command line:
-qopt-report=5
Windows* OS command line:
/Qopt-report:5
Visual Studio* IDE:
C/C++
Diagnostics [Intel C++]
Optimization Diagnostic Level
Level 5 (/Qopt-report:5)
Enable vectorization
Linux* OS command line:
-vec
Windows* OS command line:
/Qvec
Enable SIMD directives
Linux command line:
-simd
Windows* OS command line:
/Qsimd
Enable generation of multi-threaded code based on OpenMP* directives.
Linux* OS command line:
-qopenmp
Windows* OS command line:
/Qopenmp
Visual Studio* IDE:
C/C++
Language [Intel C++]
OpenMP Support
Generate Parallel Code (/Qopenmp)

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.