MT5763 Lecture 14

When waiting a long time for our code won't work - what should we be fixing?

• Should we care?
  • Programmer time is more precious than computer time

If it ain't broke, don't fix

• What is profiling?

• Basic timing of things sys.time and system.time
• Detailed profiling Rprof
• Fine-scale profiling with precision measures microbenchmark
• User-friendly profiling within R-Studio

• Dynamic sizing of objects and rbind hell
• Vectorisation
• Steal someone else's stuff (“steal” - give credit obvs)
• Parallelise
• Compile something (perhaps rcpp)
• Get a bigger computer

We've covered:

• Ways to determine where our code is slow and some common ways to fix common problems

Next:

• Mainly parallelisation