Intel® Advisor User Guide

User Guide

Contents

Run
Vectorization and Code Insights
 Perspective from GUI

Prerequisite:
In the graphical-user interface (GUI): Create a project and specify an analysis target and target options.
To configure and run the
Vectorization and Code Insights
 perspective from the GUI:
  1. From the
    Analysis Workflow
     tab, configure the perspective and set analysis properties, depending on desired results:
    • Select a collection accuracy level with analysis properties preset for a specific result:
      • Low
        : Get the basic insights about vectorized and un-vectorized loops in your code.
      • Medium
        : Identify the number of times loops execute to make better decisions about your vectorization strategy.
      • High
        : Analyze application memory usage and performance values that help you make better decisions about your vectorization strategy in details.
    • Select the analyses and properties manually to adjust the perspective flow to your needs. The accuracy level is set to
      Custom
      .
    The higher accuracy value you choose, the higher runtime overhead is added to your application. The
    Overhead
     indicator shows the overhead for the selected configuration. For the
    Custom
     accuracy, the overhead is calculated automatically for the selected analyses and properties.
    By default, accuracy is set to Low. For more information, see Vectorization Accuracy Presets.
  2. If you want to limit the Characterization and/or MAP analyses to one or more specific loops/functions instead of analyzing the whole application:
    • From a Survey report generated: Mark one or more un-vectorized loops by enabling the corresponding checkboxes in the report.
  3. If you want check for loop-carried dependency to safely vectorize scalar loops, select the
    Dependencies
     analysis. For more information about the Dependencies analysis and report, see Find Data Dependencies.
  4. Click button to run the perspective.
    While the perspective is running, you can do the following in the
    Analysis Workflow
     tab:
    • Control the perspective execution:
      • Stop data collection and see the already collected data: Click the button.
      • Pause data collection: Click the button.
      • Cancel data collection and discard the collected data: Click the button.
    • Expand an analysis with to control the analysis execution:
      • Pause analysis and see the already collected data: Click the button.
      • Stop analysis and start the next analysis selected: Click the button.
      • Interrupt execution of all selected analyses and see the already collected data: Click the button.
To run the
Vectorization and Code Insights
 perspective with the Low accuracy from the command line interface:
advisor --collect=survey --project-dir=./advi  -- myApplication
To generate command lines for selected perspective configuration, click the
Command Line
 button.
Once the data is collected, the Survey report opens showing a
Summary
 tab. Depending on the selected accuracy level and perspective properties, continue to investigate the results:
  • After you run the
    Vectorization and Code Insights
     perspective, the collected
    Survey
     data becomes available for all other perspectives. If you switch to another perspective, you can skip the Survey step and run only perspective-specific analyses.
  • If the Survey analysis does not collect enough data to produce a report, it displays a
    Target executed too quickly or does not contain debug symbols
     message. Increase the target workload or data to run the analysis for at least a few seconds, check whether debug information is specified as a build option, or specify a different target application.

Product and Performance Information

1

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