VTune profiler

-

First load an environment module:

module add vtune/XXXX

Intro:
https://www.intel.com/content/www/us/en/docs/vtune-profiler/get-started-guide/2023/linux-os.html

Help:

vtune -help

Run VTune via command line interface (recommended non-interactive use)

Run your application with VTune wrapper as follows:
www.intel.com/content/www/us/en/docs/vtune-profiler/user-guide/2023-0/command-line-interface.html

Example

mpirun -np 4 vtune –collect hotspots -result-dir vtune_hotspot ./path-to_your/app.exe args_of_your_app

After completion explore hotspot analysis e.g. via

vtune -report summary -r vtune_*

VTune-GUI (not recommended)

Login with x-window support (ssh -X) and then start

vtune-gui

Run VTune-GUI remotely on your own browser (recommended interactive use)

Login to supercomputer with local port forwarding and start vtune server in the background:

ssh -L 127.0.0.1:55055:127.0.0.1:55055 blogin.hlrn.de

salloc -p standard96:test -A zzz0002
ssh -L 127.0.0.1:55055:127.0.0.1:55055 $SLURM_NODELIST
module load vtune/2022
vtune-backend --web-port=55055 --enable-server-profiling &

Open 127.0.0.1:55055 in your browser (allow security exception, if first time set initial password)

Under WHAT (in 1st "Welcome" tab)
-> Click: Configure Analysis
--> Application: /path-to-your-application/program.exe
--> Check: Use app. dir. as work dir.
--> Expand "Advanced": keep defaults but paste "Wrapper script:"
	#!/bin/bash
	# Prefix script
	echo "Target process PID: ${VTUNE_TARGET_PID}"
	# Run VTune collector
	mpirun -np 2 "$@"
--> Expand "Advanced"
---> keep defaults but paste "Wrapper script:"
---> Check: Trace MPI
Under HOW (in 1st "Welcome" tab)
-> Run "Performance Snapshot"
When complete (in 2nd tab r0...)
-> for overview expand: "HPC Perf. Characterization"
-> for results & to select next analysis expand: "Performance Snapshot" 
--> Click: "Hotspots"

Under HOW (in 3rd tab r0...)
-> Run "Hotspots"
When complete (after finalizing results)
--> Expand sub-tab "Top-down Tree"
---> In "Function Stack" expand "_start" fct. and expand further down to "main" fct. (first with entry under "Source File") 
---> Double click on: source_file_name.c
--> In new sub-tab "source_file_name.c" scroll down to line with max. "CPU Time: Total" to find hotspot

To quit press "Exit" in the "Menu" (upper left symbol of "three horizontal bars")
Close browser page
Exit compute node via CTRL+D
squeue -l -u $USER
scancel your-job-id
Exit login node via CTRL+D