wiki:Public/User_Guide/IA

Intel Advisor XE (Vectorisation analysis)

Version 0.1, 09.01.2017
Please send feedback or questions to heinrich.bockhorst(at)intel.com

Load the necessary modules

$ module load Intel
$ module load Advisor

Analysis

This tool analyses SIMD vectorisation of programs compiled with Intel compiler. Please add "-g" to the compile line.
The analysis is done in several steps. The results of each step are accumulated into the current display.
All steps can be done using the Advisor GUI:

$ advixe-gui

For analysis on clusters it may be good to do these steps using the command line interface because there might be no X connection.

  • Getting help:
    $ advixe-cl --help > advisor_help.txt
    
  • Getting help on collection:
    $ advixe-cl --help collect > advisor_help_collect.txt
    
  • Survey analysis (light weight profiling):
    $ advixe-cl --collect survey --project-dir ADV -- $PRG $FLAGS
    
  • Analyse survey results - subset of loops printed in csv format:
    $ advixe-cl --report=survey -format=csv --project-dir ADV | cut -d "," -f 1,2,3,5,6 > survey_short.txt
    
    —> Shows all loops. Loops that are not vectorised are marked with "SCALAR". Note the IDs (first column) of the top scalar loops for later use.
    —> Can be also viewed by the GUI.
  • Trip count and flops analysis:
    $ advixe-cl --collect tripcounts -flops-and-masks --project-dir ADV -- $PRG $FLAGS
    
  • Dependency analysis for Loop ID=5 shows to be scalar in survey above (for example, you may have other IDs):
    $ advixe-cl --collect dependencies -mark-up-list=5 --project-dir ADV -- $PRG $FLAGS
    
  • Map (memory) analyis for the above loop showing stride:
    $ advixe-cl --collect map -mark-up-list=5 --project-dir ADV -- $PRG $FLAGS
    
    —> view results with GUI or ASCII report
  • Generate snapshot (compressed result file). Can be copied to another computer and analysed:
    $ advixe-cl --snapshot --project-dir ADV --pack --cache-sources --cache-binaries -- snapshot_01
    
    —> Open snapshot by starting the GUI and select "open result".
Last modified 4 years ago Last modified on Jul 23, 2018, 2:15:53 PM