Compile OpenMP on Perlmutter

Due 2024-10-08.

The goal of this homework is to make you learn to compile OpenMP code on Perlmutter.

Spawn an interactive shell

In the previous homework, you have experimented with methods to queue jobs from a login node. In this one, you will take a slightly different approach to run jobs on a Slurm system to observe your job outputs directly. Specifically, you can utilize salloc to allocate resources for an interactive session. After running this command, you will land on the compute nodes you just allocated where you can start a new shell with srun. The use of srun here is only slightly different from how you used it in sbatch files. In addition to all the other arguments, you need to add --pty /bin/bash -l to the end of your srun command to explicitly inform the system that you would like to start an interactive shell. Then on this shell, you can run your compiled C++ programs and directly read their outputs. Below we demonstrate how to spawn an interactive shell from an allocation of 16 cpu cores:

salloc --nodes 1 --qos interactive --time 01:00:00 --constraint cpu --cpus-per-task 16 --account m4776
srun -n 1 -N 1 -p development -t 00:05:00 --pty /bin/bash -l

Your tasks

You have one task:

• Compile and run omp_hello.cpp and screenshot its output on Perlmutter.