HPC mid-day session

Part 1: morning materials

1. Answer any questions.
2. Go together through the challenges, do some exercises, and debug problems.

Part 2: afternoon materials

1. Review the program for this afternoon: you have 1h15m of videos to watch.

By the end of the day you should be familiar with:

• how jobs are scheduled in Slurm
• submitting serial, shared-memory, distributed-memory and hybrid jobs
• submitting array jobs
• running interactive jobs, and switching between interactive and batch jobs for the same task
• how to estimate memory requirements of a completed Slurm job

Some of the hands-on exercises we will do in the afternoon Zoom session:

• Using a serial job, time optimized (-O2) vs. unoptimized C code.
• Using a serial job, time a C code vs. a Python code.
• Submit an array job for different number of terms in the summation of \pi.
• Try scaling an MPI job with 1 -> 2 -> 4 -> 8 cores and measuring the speedup.
• Test a code inside an interactive job.