Add learning objectives for HPC Scalability Profiling

[steve-crouch]

There are no learning objectives for the HPC Scalability Profiing lesson, although they do already exist for the original materials upon which they are based. A suggested ported set of learning objectives (curated to what's in the UNIVERSE-HPC version) are:

• Understanding Code Scalability
  • Describe why code scalability is important when using HPC resources.
  • Explain the difference between wall time and CPU time.
  • Describe the differences between strong and weak scaling.
  • Summarise the dangers of premature optimisation.
• Scalability Profiling
  • Explain how Amdahl’s Law can help us understand the scalability of code.
  • Use Amdahl’s Law to predict the theoretical maximum speedup on some example code when using multiple processors.
  • Understand strong and weak scaling graphs for some example code.
  • Describe the graphing characteristics of good and bad scalability.