Cray Performance Measurement and Analysis Tools (CrayPat)

CrayPAT offers thorough data on how well an application performs. It can be used for hardware performance counter-based analysis, tracing, and profiling. It also gives users access to numerous user interfaces that let them access the experiment and reporting features, as well as a large selection of performance experiments that assess how much resource an executable program uses while it is executing.

Sampling experiment

• Load the modules.

module load perftools-base
module load perftools-lite
module rm darshan

• Build the application as usual.

• Copy the following commands in to a file named job.slurm. Please add the partition and account in the batch script if necessary.

#!/bin/bash

#SBATCH -t 30
#SBATCH -N 1

# Change the name of the perftools experiment file/directory
export PAT_RT_EXPDIR_NAME=expfile.${CRAYPAT_LITE}.${SLURM_JOBID}

time srun -n 8 /path/to/myexecutable.exe > my_output.${CRAYPAT_LITE}.${SLURM_JOBID} 2>&1

• Launch the application.

sbatch job.slurm

• Inspect the program output my_output.lite-samples.*.

• More information can be retrieved with

pat_report -o myrep.sample.rpt expfile.lite-samples.*

• myrep.sample.rpt contains the performance report.