Intel® Advisor User Guide

User Guide

Contents

Run
Threading
 Perspective from Command Line

Threading perspective includes several steps that you are recommended to run one by one:
  1. Collect performance metrics and find candidates for parallelizing using a
    Survey
     analysis.
  2. Annotate
     manually loops/functions to model parallelization for.
  3. Model parallel design options and estimate speedup for the annotated loops using a
    Suitability
     analysis.
  4. Check for loop-carried
    dependencies
     to make sure the loops/functions are safe to parallelize.
See
Intel Advisor
 cheat sheet for quick reference on command line interface.

Prerequisites

Set
Intel Advisor
 environment variables with an automated script to enable the
advisor
 command line interface (CLI).

Run
Threading
 Perspective

Note
: In the commands below, make sure to replace the
myApplication
 with your application executable path and name
before
 executing a command. If your application requires additional command line options, add them
after
 the executable name.
  1. Run the Survey analysis. 
    advisor --collect=survey --project-dir=./advi_results -- ./myApplication
  2. Run the Characterization analysis to collect trip counts and FLOP data. 
    advisor --collect=tripcounts --project-dir=./advi_results --flop -- ./myApplication
  3. View the Survey report to identify candidates for parallelization. For example, run the following command to print the report in command line:
    advisor --report=survey --project-dir=
    <project-dir>
    Consider analyzing loops/functions with high total time.
  4. In the application source code, annotate loops/functions of interest to model parallelization for.
    Rebuild the application as usual to make the annotations available for the Intel Advisor.
  5. Run the Suitability analysis to model threading for the annotated loops/functions: 
    advisor --collect=suitability --project-dir=./advi_results -- ./myApplication
  6. Run the Dependencies analysis to check for loop-carried dependencies in the annotated loops: 
    advisor --collect=dependencies --project-dir=./advi_results -- ./myApplication
You can view the results in the Intel Advisor graphical user interface (GUI), print a summary to a command prompt/terminal, or save to a file. See View the Results below for details.
Analysis Details
Each analysis in the
Threading
 perspective has a set of additional options that modify its behavior and collect additional performance data.
Consider the following options:
Characterization Options
To run the Characterization analysis, use the following command line action:
--collect=tripcounts
.
Recommended action options:
Options
Description
--flop
Collect data about floating-point and integer operations, memory traffic, and mask utilization metrics for AVX-512 platforms.
--stacks
Enable advanced collection of call stack data.
Dependencies Options
To run the Dependencies analysis, use the following command line action:
--collect=dependencies
.
Recommended action options:
Options
Description
--filter-reductions
Mark all potential reductions with a specific diagnostic.
See advisor Command Option Reference for more options.

Next Steps

Continue to explore threading results. For details about the metrics reported, see CPU and Memory Metrics.

Product and Performance Information

1

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