Vtune/fr

Introduction

VTune est un produit d'Intel pour analyser la performance des systèmes et des applications OpenMP et MPI.

Module logiciel

Pour charger le module sur une de nos grappes, lancez

[name@server ~]$ module load vtune

Nom du produit

The content of this page is largely concerned with the legacy version named Intel® VTune™ Amplifier. Please note this tool has been renamed throughout Intel's documentation in latest versions (newer than the latest vtune module versions presently available on Compute Canada clusters) from Intel® VTune™ Amplifier to Intel® VTune™ Profiler. Likewise the application commands amplxe-cl and amplxe-gui have been renamed to vtune and vtune-gui for both the command line and graphical tools respectively. Once a version with the newer naming convention is available as a loadable module in the forthcoming default StdEnv/2020 environment this Wiki page will be updated accordingly. Further information can be found here.

Types d'analyses

To collect analysis information run:

[name@server ~]$ amplxe-cl -collect <analysis-type> <target_exe> <exe_arguments>

where <analysis-type> should be replaced by one of the available analysis, e.g. hotspots, and <target_exe> is the path to the executable you would like to analyze. It is recommended to compile your executable with the "-g" option and to use the same optimization level as normal so as to obtain accurate results. A listing of version specific argument options and several usage examples maybe displayed on the command line by running amplxe-cl -help, after loading the vtune module. Complete downloadable documentation for Parallel Studio XE (including VTune) for all recent versions can be found here. The latest version of the Intel VTune Profiler User Guide may be found here.

Créer un rapport

Pour créer un rapport, lancez

[name@server ~]$ amplxe-cl -report <report-type>

où <report-type> est le type de rapport à générer (hotspots). Voyez aussi la page Generate Command Line Reports.

Exemple de matrice

Pour analyser et générer le projet Intel Matrix Sample Project en ligne de commande avec 4 cœurs :

salloc --time=1:00:00 --cpus-per-task=4 --ntasks=1 --mem=16G --account=def-yours
module load StdEnv/2016.4 *OR* StdEnv/2018.3
module load intel/2019.3 (optional)
module load vtune/2019.3
cp -a $EBROOTVTUNE/vtune_amplifier/samples/en/C++/matrix .
cd matrix/linux
make icc
amplxe-cl -collect hotspots ../matrix
amplxe-cl -report summary 

La plus récente version de matrix_multiply (qui construit avec cmake) se trouve ici.

Mode graphique

The Intel Matrix Sample Project can also be run using Vtune in GUI mode as explored here [1]. To run VTune over VNC follow the below directions depending on which system you wish to use. Running VTune graphically can be useful to generate command line configurations as discussed in [2].

Nœuds des grappes

1. Connectez-vous à un nœud de calcul ou à un nœud de connexion avec TigerVNC;
2. module load StdEnv/2016.4 *OR* StdEnv/2018.3
3. module load intel/2019.3 (optional)
4. module load vtune/2019.3
5. amplxe-gui
   

Nœuds VDI

1. Connectez-vous à gra-vid avec TigerVNC;
2. module load CcEnv StdEnv/2016.4 *OR* StdEnv/2018.3
3. module load intel/2019.3 (optional)
4. module load vtune/2019.3
5. amplxe-gui
   

MPI example

First, load the latest VTune module.

module load StdEnv/2020
module load vtune

Then compile your MPI program as you usually would and run it inside a job or in an interactive session started by a salloc command using:

srun aps your_mpi_program.x

After the program finishes, the profiling data will be stored in a directory called aps_result_YYYYMMDD where YYYYMMDD is the current date.

There is a lot of information you can extract from that data. To get the basic summary report of your program's performance, run:

aps-report  -D aps_result_YYYYMMDD

where you would replace YYYYMMDD to match the actual directory that has been created. This command creates an HTML file, which can be copied to your own computer and viewed in a browser. The report will clearly identify performance issues that are affecting your code.

Example report generated by aps for an MPI program

Message Passing Interface