perf-report is a lightweight profiling tool that provides basic information about where the computing time is actually spent in a given application. It is developed by ARM (formerly Allinea) https://developer.arm.com/tools-and-software/server-and-hpc/debug-and-profile/arm-forge and very easy to use, i.e. by simply prefixing the usual executable with a call to perf-report.

For example, analyzing a simple MPI job could be done with the help of the following submit script to SLURM

 #!/bin/bash
 #
 #SBATCH -J prflng        
 #SBATCH -N 2 
 #SBATCH -L allinea@vsc
 #SBATCH --ntasks-per-node=16
 #SBATCH --ntasks-per-core=1
 #SBATCH --time=00:10:00

 module purge
 module load intel-mpi/5
 module load allinea/6.0.6_PR
  
 perf-report mpirun -np 32 a.out
 

This will result in the creation of two summary files in *.txt and *.html format providing an overview of the relative time spent in MPI, I/O, OpenMP etc.

Explanations, examples, typical cases at http://content.allinea.com/downloads/getting-started.pdf