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Intel Trace Analyzer and Collector

Intel Trace Analyzer and Collector (ITAC) are two tools used for analyzing MPI behavior in parallel applications. ITAC identifies MPI load imbalance and communication hotspots in order to help developers optimize MPI parallelization and minimize communication and synchronization in their applications. Using Trace Collector on Cori must be done with a command line interface, while Trace Analyzer supports both a command line and graphical user interface which analyzes the data from Trace Collector.

Environmental models for ITAC in ULHPC

module load purge
module load swenv/default-env/v1.2-20191021-production
module load toolchain/intel/2019a
module load tools/itac/2019.4.036
module load vis/GTK+/3.24.8-GCCcore-8.2.0

Interactive mode

# Compilation
$ icc -qopenmp -trance example.c

# Code execution
$ export OMP_NUM_THREADS=16
$ -trace-collective ./a.out

# Report collection
$ export VT_STATISTICS=ON
$ stftool tracefile.stf --print-statistics

Batch mode

Shared memory programming model (OpenMP)

Example for the batch script:

#!/bin/bash -l
#SBATCH -J ITAC
###SBATCH -A <project_name>
#SBATCH -N 1
#SBATCH -c 16
#SBATCH --time=00:10:00
#SBATCH -p batch

module purge
module load swenv/default-env/v1.2-20191021-production
module load toolchain/intel/2019a
module load tools/itac/2019.4.036
module load vis/GTK+/3.24.8-GCCcore-8.2.0

$ export OMP_NUM_THREADS=16
$ -trace-collective ./a.out

To see the result

$ export VT_STATISTICS=ON
$ stftool tracefile.stf --print-statistics

Distributed memory programming model (MPI)

To compile

$ mpiicc -trace example.c
Example for the batch script:
#!/bin/bash -l
#SBATCH -J ITAC
###SBATCH -A <project_name>
#SBATCH -N 2
#SBATCH --ntasks-per-node=28
#SBATCH --time=00:10:00
#SBATCH -p batch

module purge
module load swenv/default-env/v1.2-20191021-production
module load toolchain/intel/2019a
module load tools/itac/2019.4.036
module load vis/GTK+/3.24.8-GCCcore-8.2.0

srun -n ${SLURM_NTASKS} -trace-collective ./a.out
To collect the result and see the result in GUI use the below commands
$ export VT_STATISTICS=ON
$ stftool tracefile.stf --print-statistics

ITAC Summary

ITAC profile

ITAC event time

Tip

If you find some issues with the instructions above, please report it to us using support ticket.


Last update: November 18, 2020